There was a lot of confusion in the Forum discussion, until it became clear that it only happened when the user changed the ROX-Filer "placement granularity" -- the default of which is "fine" (2 pixels).
Once the cause became clearer, K Godt, npierce, MinHundHettePerro and others analysed the problem and proposed solutions, or at least steps to reduce the problem.
npierce has summarised it nicely in a post in this thread, with two possible partial solutions:
I have implemented #3. Woof commit:
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