When I searched Lego Gotham City Cycle your item came up first in best match. When I tried a couple of variation using Batman in the search, your item came up under 'listings with fewer words' so my guess is that the problem is where you have Batman in your title...near the end.
The name on the box is Lego Batman Gotham City Cycle Chase so I would probably use that as the first words in my title. If buyers tend to search using the model no. I would probably put that next.
It isn't always easy to figure out search terms buyers use and what ebay thinks is important so sometimes you have to play with the title. I don't know how accurate it is but I have read that ebay tends to look at the first few words in the title rather than the whole title. Keep in mind too that the search is supposedly 'intelligent' so what I see may not be what you see as we tend to search for different things.
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