There is no problem when playing in full screen, but when playing on a small screen, the boxes collide. I couldn't quite understand why but i will try to solve it. Thanks for the feedback!
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My best guess is that it could be the Unity UI system, because depending on how you set the Canvas it can or adjust to the size of the screen, follow it's proportions, or the sizes are kept and scaled down or up depending on the size of the screen (I know from experience, unfortunately lol). But if I remember anything that can help with it, I'll let you know