Tactics change automatically

I’m playing for a long time accepted the fact that I didn’t pay so players with 60-70 physical abilities will take down van dijk and van de ven and that’s my striker with 95 pace and gold rapid is slower then my grandpa ok.

but why the defensive line go suddenly up in the 79-80 minutes? All the game my defence works amazing but when the opponent needs a goal it’s happening like magic didn’t change nothing even when it’s happening again and I change it to 4-5-1 with 40 on defensive line the entire team is going to the opponent half got my instructions and tactics right and all the game my defensive line was great so what is the **bleep** bug? and yes I want to park the bus so what is this?

on the contrary when I want to press and change to 4-2-4 with 96 defensive line my players stay low with more holes then my goalkeeper hands got