An update: I need confirmation on people using big Android phones, but I may have pinpointed what could be causing the problem. See, Ren'Py defines "small" mobile devices as having 6 inch screens or smaller, and "medium" devices as anything else. Looking up the Galaxy A10, it apparently is large enough to count as a "medium", but has the form factor of a phone rather than a tablet.
In the new GUI code, I've been using "small" and "medium" variants as the way to differentiate between phones and tablets, since that is the recommended way of handling the variants for maximum compatibility. But since there are now phones that have bigger screens, those phones may break the GUI code and try to display the tablet GUI on a phone screen.
If I could get a confirmation on this happening in the current hotfix, I can look into another hotfix to correct this issue. I prefer to follow the recommendations when it comes to things I can't test, but it seems like I may have to change the variant names if my hunch here is correct...