FC25, but I can't change the player from the member list.

I'm playing Willem II in the Eredivisie on FC25, but I can't change the player from the member list. Even if I select a player and then choose a replacement, the player doesn't change. I can change it on other teams. I can't do it with Willem II. I tried restarting the steam PC itself, restarting steam, and restarting FC25, but it didn't work.