Question or Issue
Text Fields with mixed-case values result in an incorrect value display for filter dropdowns.
If one record has a Billing Country of USA and another has usa, they are counted as 2 different values but appear in the filter dropdown as only one. This causes the total number of values and the number of checkboxes to be different.
Related Known Errors and Workarounds
Check the Select All checkbox on a mixed-case field to display the proper results, but when you open the filter again, Select All will be unchecked.