Leave application issue

The issue appear like this- (history repeats)
There are 2 persons: one is an employee and another is a leave approver

Employee applied a leave-
Manager logged in and had changed his language then the leave application was disappeared.
I checked the issue could not make sense. I reshared the profile of the employee with the leave approver(also the manager of the employee). I had removed the permissions then added again. Later, the leave approver able to see the application but did not able to approve anyting even had the right permission set. Plus, it messed up the employees’ leave application screen.

This issue appear out of nowhere. I removed and re-added permissions but had no luck. Restoring from a backup now.