🐛 Remove incorrect looping from grid check

Author: kzscisoft

simvue/api/objects/grids.py

@@ -33,12 +33,14 @@
 __all__ = ["Grid"]
 
 
-def check_ordered_array(axis_ticks: list[float] | numpy.ndarray) -> list[float]:
+def check_ordered_array(
+    axis_ticks: list[list[float]] | numpy.ndarray,
+) -> list[list[float]]:
     """Returns if array is ordered or reverse ordered."""
     if isinstance(axis_ticks, numpy.ndarray):
         axis_ticks = axis_ticks.tolist()
     for i, _array in enumerate(axis_ticks):
-        if not isinstance(_array[i], float):
+        if not isinstance(_array[0], float):
             raise ValueError("Ordering can only be checked on a 1D array")
         _array = numpy.array(_array)
         if not numpy.all(numpy.sort(_array) == _array) or numpy.all(