Admin/Studio changes to Dropdown lists not taking effect

[ishanivardhan]

Issue

SuiteCRM Version 7.11.2 Sugar Version 6.5.25 (Build 344)

Any changes done from Admin/Studio is being reset. I have created few drop-downs from Dropdown editor but when trying to select them for a field, they are nowhere to be seen.
Revisiting Dropdown Editor then doesn't show those lists at all
I have created a custom field under Contacts module and saved changes but going away from the page and coming back to it makes the label revert to "System Label" and my display label is nowhere to be seen.
Similarly, adding fields to layouts followed by Save & Deploy doesn't actually show the field int the layout.

I have performed Quick Repair & Rebuild followed by logging in/out and clearing my cache.
The cache folder has got drwxr-x--x with correct owner. Nothing shows in the logs as well.

Expected Behavior

1. Dropdowns created from Dropdown editor should still show in the list and when selecting a dropdown for a field.
2. The custom field's display label should stay as is without reverting to System Label
3. Fields added to layouts should show up on Save and Deploy

Actual Behavior

1. Drop-downs created vanish when you navigate away from the page and come back to Dropdown editor or Studio > Contacts > Fields when selecting the dropdown for a field

2. Fields have System label shown for Display label

3. Fields added in layouts don't show even on Save & Deploy

Quick Repair & Rebuild doesn't help and not sure if it should be used to fix this problem. Nothing in suitecrm.log

======================
One thing to mention is sometimes not sure how the field starts to display the label correctly with correct dropdown and that field shows in the layout too. So, completely clueless why changes don't reflect straightaway and some times do reflect.

Your Environment

• SuiteCRM Version 7.11.2 Sugar Version 6.5.25 (Build 344)
• Chrome Version 74.0.3729.169 (Official Build) (64-bit)
• Environment name and version (PHP 7.2.18)