A few Things you can try.
1), 2) ,and 3) you can try on your Own.
4) you need to get help from customer service
1) Do you know your iStripper Password?
Log out of iStripper, then Log Back in.
2) You Do not remember your iStripper Password.
Quit istripper
Browse to the Data folder
Find the File models-dolz.vghd
Rename or Delete it.
Re-Start iStripper
Both 1) and 2) will cause the iStripper app to
get a New Collection List from the Server
and Rebuild the Collections
3) is a bit more Involved, and you need access to a 2nd Wallet, or a good Friend you can Trust that has a Wallet.
Using the Marketplace or Opensea
Transfer your NFT cards From your Wallet to the 2nd Wallet.
Then Transfer them Back from the Other Wallet to your Wallet.
This is the Process I had to use to get the NFT's to show in my iStripper Collection.
4) contact customer service for Help.