There seems to be a bug in Garagesale where it’s adding hyphens (-) into the links for store categories, making them non-functional.
Here’s an example of a listing suffering the problem:
Chev / Holden stickers for LS1 LS2 LS3 6.5 V8 diesel duramax turbo - PAIR | eBay
As you can see, the store name is “Australian Images store”. The category links down the side go to error pages.
A link generated by eBay to a store category is:
While Garage Sale generates this for the same category:
Garage sale is putting hyphens in to the link where spaces exist in the store name, plus there are a few other differences.
There are a few other posts about this dating back to GS7, but doesn’t seem to be a solution. I initially tried this in GS 8.4, but just updated to 9.05 and the bug persists.