I have seen several cases recently when Matching questions are very sensitive to any kind of special characters. So I was wondering if this is a bug or if we have a workaround.
Answer1: Reasonable Domain Match1: 0<x<9
Answer2: Reasonable Range Match2: 0<x<250
If you type exactly like this, then you will see only the first character (0) in the drop-downs
If you will type 0 < x < 9 (add spaces), then you will always get it "wrong", unless you remove < characters.
I confirmed this on several M2 instances, including demo site.
Other characters that I had sometimes to remove from matching questions were ' " and ...