Steps to reproduce:
- Navigate to a place that has a Select all checkbox (e.g. Sites > Content > Web Content > Ellipsis > Structures)
- Flag the 'select all' checkbox
- Unflag it
Checkbox will be unflagged, and return to its original state.
Instead of returning to an empty position, the check mark is replaced with a box. See attached gif.
Note: in IE_11, the checkbox becomes uneditable