Latest updat has made some of my playable sims disappear

Ever since I updated my game, some of my playable Sims that I've created keep disappearing. I remade a few households yesterday, but when I saved them, they disappeared again. This us in the sim inventory screen if that is of any help and all the NPC sims are unaffected.

Has anyone else come across this issue or can help me out, please.

Thank you.