That might be caused by using a save from a later version of Lust Doll+. Do you have any screenshots?
if a xxx game exists, it can be found on F95zone, i found a link for the 23.1 version on there, here it is:
https://mega.nz/file/KJMBnKpb#Odh-98VvBjyyH1YMfGDPT7k2nmN4yOYd8QmG2dCfayQ