diff --git a/jsx/StaticDataTable.js b/jsx/StaticDataTable.js
index 50f3dae044..07f91c0a57 100644
--- a/jsx/StaticDataTable.js
+++ b/jsx/StaticDataTable.js
@@ -290,6 +290,63 @@ class StaticDataTable extends Component {
     });
   }
 
+  /**
+   * Get if the current sorting column has mixed types in its values.
+   *
+   * @return {boolean} true if mixed types, else false.
+   */
+  hasMixedTypes() {
+    // TODO: data column type check should probably be done once at init,
+    // meaning when receiving data, to find which columns have mixed types.
+    let typeFound = null;
+
+    // not the default column
+    if (this.state.SortColumn === -1) {
+      return false;
+    }
+
+    // Only checks string or number types, others are considered undefined.
+    // Break out of this loop once we encounter two mixed types:
+    // number and string inside the sorted column.
+    for (const row of this.props.Data) {
+      // cell value
+      let val = row[this.state.SortColumn];
+
+      // if null or undefined, go to the next iteration
+      if (val == null) {
+        continue;
+      }
+
+      // check number
+      if (!isNaN(val) && typeof val !== 'object') {
+        // if string is found, mix of types, break
+        if (typeFound === 'string') {
+          return true;
+        }
+        // register number only if not already in
+        if (typeFound == null) {
+          typeFound = 'number';
+        }
+
+        // avoid string section
+        continue;
+      }
+
+      // check string
+      if (typeof val === 'string' || val instanceof String) {
+        // if number is found, mix of types, break
+        if (typeFound === 'number') {
+          return true;
+        }
+        // register string only if not already in
+        if (typeFound == null) {
+          typeFound = 'string';
+        }
+      }
+    }
+    return false;
+  }
+
   /**
    * Sort the rows according to the sort configuration
    *
@@ -298,6 +355,10 @@ class StaticDataTable extends Component {
   getSortedRows() {
     const index = [];
 
+    // is the current sorted column with mixed type?
+    const isMixedType = this.hasMixedTypes();
+
+    //
     for (let i = 0; i < this.props.Data.length; i += 1) {
       let val = this.props.Data[i][this.state.SortColumn] || undefined;
       // If SortColumn is equal to default No. column, set value to be
@@ -311,10 +372,12 @@ class StaticDataTable extends Component {
       if (val === '.') {
         // hack to handle non-existent items in DQT
         val = null;
-      } else if (isNumber) {
+      } else if (isNumber && !isMixedType) {
         // perform type conversion (from string to int/float)
         val = Number(val);
-      } else if (isString) {
+      } else if (isString || isMixedType) {
+        // in case of mixed types, force values to string.
+        val = String(val);
         // if string with text convert to lowercase
         val = val.toLowerCase();
       } else {
diff --git a/modules/issue_tracker/php/edit.class.inc b/modules/issue_tracker/php/edit.class.inc
index 8cefd0c440..b0f36c254c 100644
--- a/modules/issue_tracker/php/edit.class.inc
+++ b/modules/issue_tracker/php/edit.class.inc
@@ -96,7 +96,7 @@ class Edit extends \NDB_Page implements ETagCalculator
             $inactive_users_expanded = $db->pselect(
                 "SELECT DISTINCT u.Real_name, u.UserID FROM users u
                  LEFT JOIN user_psc_rel upr ON (upr.UserID=u.ID)
-                 WHERE FIND_IN_SET(upr.CenterID,:CenterID) OR (upr.CenterID=:DCC)
+                 WHERE (FIND_IN_SET(upr.CenterID,:CenterID) OR (upr.CenterID=:DCC))
                  AND Active='N'",
                 [
                     'CenterID' => $CenterID,
diff --git a/tools/detect_duplicated_commentids.php b/tools/detect_duplicated_commentids.php
index 2c0d0070cb..ac183c5ef3 100755
--- a/tools/detect_duplicated_commentids.php
+++ b/tools/detect_duplicated_commentids.php
@@ -102,7 +102,7 @@
             $candid = $candidate['CandID'];
             $pscid  = $candidate['PSCID'];
             foreach ($cohortids as $cohortid) {
-                $session_info = $DB->pselectRow(
+                $session_info = $DB->pselect(
                     "SELECT DISTINCT s.Visit_label,s.ID from session s
                     JOIN candidate c on (c.candid=s.candid)
                     JOIN flag f on (f.sessionid=s.id)
@@ -115,8 +115,8 @@
                     ]
                 );
                 if (($session_info!=null) && (!empty($session_info))) {
-                    $sessionid   = $session_info['ID'];
-                    $visit_label = $session_info['Visit_label'];
+                    $sessionid   = $session_info[0]['ID'];
+                    $visit_label = $session_info[0]['Visit_label'];
                     if ($sessionid !=null) {
                         $commentid = getCommentIDs(
                             $instrument,