Removing a criteria messes up with variables and adds all variables from the query in the SELECT, even if not selected

[tfrancart]

I write a query with 2 criterias, keeping only the first variable selected:

Now I add a third criteria:

Then I remove the third criteria, and when rerunning the query, I see that all variables are selected in the SPARQL (Title_2 and Concept_X), while they don't show in the variable selection area