Sorry to dig up an old thread, but I didn't want to start a new one since I've had the same issue.
A few days ago my character, who is female, changed to a male. The weird thing is, she still has her female face with makeup. Everything else about her is a male. The clothes I buy, its hairstyles, its mannerisms, etc. All male.
I opened a ticket with Rockstar. I also noticed many other players were having this issue as well. Rockstar has not responded to ANY of the players' questions regarding the gender change of their characters.
I can't even enjoy this update with my tranny character. I miss dressing her in mini-skirts and high heels. The best I can do now is dress her like a butch lesbian.