What's the best method or remedy for removing leave given erroneously to current employees?
To change the o/s leave I would edit their name and go to the leave tab and override the figure with the correct one
Calculate what it should be first, then override the figure manually in the employee's record.
NOTE: Pay attention to the "... as of ..."date & ensure your calculation is as at this same date:
This date is generated from the Paycheques but actually refers to the pay period eg
In the above screenshot, the employee is paid on 18/07 for weekly pay period 11/07 - 17/07. Their record shows leave " ... available as at 17/07/22" (NOT as at 18/07)