Script prevents other script (skip stage) pls help

Ok, so i have been making Guess The Anime game.
i got to the skip stage for robux part and it doesn’t work.
when i buy skip stage it doesn’t teleport to the next stage
but then i saw that the problem was with the donation board.
when i deleted it, the skip stage worked.
and when i put it back it doesn’t
this is the link for the board-- https://www.roblox.com/library/3266631920/Update-Donation-Board
and this is the Checkpoint script – ROBLOX Scripting | Server Script | Skip Stage Checkpoints - Pastebin.com

Is the donation board a free model ? And is the “skip stage” a dev product or a gamepass ?

yes, the donation board is free modal and skip stage is dev product.

The donation board might be messing up the code for your dev product.

I would suggest removing it and making your own donation board, as it is way safer and you could make changes at any point of time.

Here is a tutorial that you might wanna follow :