Thank you, that worked!
I logged in, and I found one major issue, that the primary results ordering was set to Title descending so the relevance was ignored. This way results were not ordered by the relevance and the results were seemingly “missing”, when in fact they been only further down the list.
I changed it back to the default relevance option, now if I search for example “IRE” I get results as expected: https://i.imgur.com/qwtIm5G.png
