There is a loophole in the attendance system of my unit, so I miss punching in and sign the card again. How to stop this situation?

If you want to punch in, you must strictly implement it, and you can't sign the card. Employees may forget to punch in at first, be late or the miners are unhappy, but they should be taught a long lesson and pay the price. As long as they forget, they will be late or miners, without exception. After a long time, they will not forget.