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So you are counting a field that is a key linking two or more tables?
You shouldn't count a key field (at least without a DISTINCT qualifier), the result is not deterministic as Qlik does not know which table records need to be scanned.
It's also described here by Henric:
Count or Count distinct?
Without distinct. I looked for duplicates and my id is also business number. I prepared technical key, hided it and now it is better
Better or as expected? So it was count on key field?