Hey Queue ,
I encountered the same UI problem using Unreal. To resolve it, instead of using Unreal Fonts (Even if they were exported and not the engine ones ), I utilized images created with Photoshop. I attempted to replicate what I had done in Unreal with ready-made images, and then I re-exported them into the engine. This approach worked; apparently, the issue was only with fonts and not images.
Did you build the assets? Did you cook the assets before building your game executable? If you didn't i wonder if that might be what caused the issue.
Thank you for rating my game; it is much appreciated. As for the review, it can come when it comes, and thank you in advance!