The logical dilemma here is that unchecked categories are treated as exclusions. Therefore if any of the results for “lättläst” matches any of the unchecked categories, then of course it's excluded.
However I think there might be an option to help you. By default all the term selectors are connected with kind of an AND logic. Therefore the plugin will look for items matching each term (category) not counting the missing terms – in other words no result can have an unchecked or excluded category or term.
There is however a different logic (OR) built in – which is more “loose”. It allows unchecked categories, but at least 1 category must match from the non excluded ones.
To change that logic, go to the General Options -> Behavior and change the Category/Term logic option to OR: https://i.imgur.com/0tDOp2m.png
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