Sorry about that. Can you please send me your save file (you can post it on a website like pastebin.com or sharetext.io and share the link here), so I can look into it and send you a corrected version? Thanks.
i am not sure weather or not youve done any changes to the game, but the issue seems to have resolved itself? it still counts it as my first prestige and give me the 5 gems, but it no longer sends me back. regardless, here is the save https://sharetext.io/b68e575b i hope it helps :)
By "counts as your first prestige", are you referring to Expertise resetting to zero? I haven't released another update since your previous comment.
In any case, here's the save with the Diamonds refunded: https://sharetext.io/0177d9e6.