Oh no, this is such an odd behavior. Do you remember the last thing you did before checking the store?
The only fix for that right now: load and try pressing S (to open the master menu) and then checking the store. It should bring back the options, lmk if that works.
Which version did this happen in?
milfytales version 0.3766_PC, step by step as far as I can remember I was clearing the main quest in the lust mines, then after it brought me back main character's home I left to turn in the side quests teachers quest part 2-1, up ‘n’ coming battler part 1, betty’s little devils part 2 , then did betty’s discipline, smithing force Emma, then lastly went the smith’s clerk to purchase stuff is when I encountered the bug. Just now I some how fixed the issue I’m not sure how I fixed it I was chatting with the mother then studying upstairs saved my game quitted then sometime later loaded the game sparred with the straw dummy a couple of times then went back to the smith clerk where suddenly all options were available to me.