I have been noticing this glich in powder toy for several versions now, But version 87.2 seems to have taken this glich into overdrive.
The glich is that the signs are getting layered for no reason. That is, when i place a sign, it places like 5-6 signs with the same text in the same place.
Few months back, i kept 2 signs on a save, and I was unable to keep more. So i moved one sign and found an exact same sign beneath. I deleted that sign to find another one. I had to delete about 7 signs to fully clear the repeating signs.
This is how the problem started and it still continues. So i decided to report.
i've known this the first release of tpt++ back in September. I just didn't know what caused it, for example is it reloading the save? Is it pasting stamps? Is it moving a sign? No idea. It seems really annoying but it doesn't affect me so I guess I never tried to fix it ...