Font unreadably small in Fake Store popup

I’m setting up IAP in a mobile app. When I run in the editor, the player’s purchase pops up a Fake Store request with almost-unreadably small text at the very top of a large gray popup window. What could be causing this and what can be done about it? The same app works OK on an Android phone (still working on IOS)

The fake store popup is only in the Editor, you can safely ignore the font. Users would never see it, only you (the developer)