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One thing I did notice on your store is you don't have a favicon that represents your store in the browser tab. It's still using the CC favicon. That's a minor thing and has nothing at all to do with your meta problem.

OK - leaving off myfancydress and searching for 1920's costume ireland: I see your shopping ad on the first page: and your store listing on the 2nd page: I went through 10 pages of results and never saw your listing, except for these two. I'll try some searches for our store and see what I get. I tried Aurora plush animals and found our listing on the 3rd page: It does use the metadata for that category listing. But I still don't know what could be different between your code and mine. I'm so sorry I can't help.