invisible mermaid tails on children

For some reason, my merchildren show up with an invisible tail and a shirt I did not choose. Their hair also changes to the original hair when aging up instead of the hair I changed them to. I do not use any mermaid mods. When mods are removed, this problem still occurs. This is a new game, and these are children of an original sim I created for the game. (Has me hoping EA is going to give our merchildren tails!) I do wonder if the invisible tails (this is a problem that comes and goes with all mermaids) in the teens and up are related to the invisible merchildren's tails. I have Windows 11. Have everything (kits, packs, etc.) and am completely updated.