When I am in the Interval Singing activity, I attempt to match the pitch of the note played. I'm just a beginner so I usually don't get it immediately. On the info bar it says you can press Control to insert the note you are singing, but this "bug" causes the note to be inserted without pressing control! So l end up with all these notes on the staff. It is very annoying because to get the question correct I have to delete all the wrong ones that I didn't want inserted anyways! And then sometimes when I get it right on the first try and press the Control key it doesn't insert the note!
Here is a screenshot. I never pressed the Control key during this question.

This seems like the incorrect behavior for this exercise, but please let me know if I am wrong!