In the plat store if I click on Gold then click the arrow in the top left to get out of there, it lists a dialog box that says "you need more platinum to buy 2500 gold! you need 15 plat. you have [more than 15 plat]."
Looks like the game wants you to click on the X at the right first to get out of the buy gold screen. But it's not very intuitive - I bet people will start complaining about being stuck in the buy gold screen.
Edit: I'm on iPad.
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