I've worked out since that the markers '-' and '^' don't get removed correctly if they're used as markers from the expected results ie they're interpreted as regular text. Thus, removing them from the series of comment markers fixes this!

there seems to be issues with the Test suite presenting incorrect solutions when the '-' symbol is involved. There are some cases where it doesn't correctly comment out the answers.

I second that! Agreed that it doesn't handle that edge case well.