But this still does not explain why my laptop has twice as many entries than my desktop.

I don't develop styles on my laptop, when I'm gone from home, I only preview styles and songs. I sometimes even create an arrangement. But essentially, when I did something new, that is moved to my dropbox and as soon as my desktop starts I have it there, too. I try to have both installations as similar as possible, a certain type of laziness is a good reason for this.

The program "StylePicker" behaves in an unpredictable way on different computers -- so it seems.

I said it before and I repeat it: I would be happy to run a test version of the StylePicker that protocols its ways through the code on both of my computers. And I'm sure there are quite a few users on this forum who would be happy to assist also. The result could be zipped and maild to PGMusic or uploaded to one of their servers.

Desktop; i7-2600k, 8 GB mem., Win 10 Pro, BIAB 2017; RB 2017 - latest build
Laptop: i5-2410M, 4 GB mem, Win 10 Pro, BIAB 2017; RB 2017 - latest build