I too have been dealing with this issue for awhile...I THINK I have a workaround....When I import a style sheet I go in and make a simple change to the sheet (add a space somewhere) then save.
I THINK this small change forces Sigil to recognize the file ...and remember it.
Any way...I haven't had an issue since I started doing this. I'm running 8.4 but it has been happening for a long time 6.2-ish??
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