Ah. That's too bad. They must like mine. Because it almost never fails that when I check a bag that it's out in some sort of priority.
Maybe you check too many bags?
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I don't think 1 bag on 50% of trips is "too many", but I'm sure some people have other opinions.
Edited to add: in all seriousness, I think this has more to do with which airport is unloading the bags.