More HighDPI questions

[aducom]

I'm trying to look into the high-dpi docs to see if I can make an application work well under 1080p to 4K. One thing I'm currently struggling with is - for instance - the bgr sample application, i.e. the test_bgra_ribbon_custom. Under 1080P, it all works fine. However, under 4K is shows really tiny buttons/letters in the ribbon. If I add another button, it is shown ok in the correct size. I have verified project settings, and I verified the properties between the two buttons. But there is no significant difference. That puzzles me, because, why is the one button so tiny, and the other ' normal'? I'm trying to figure things out, but can someone shine a light on this?(BTW the screenshot looks odd, with a huge button, but on a 4k screen it looks different)