Variable font red flags

I’m creating a variable font but I’m getting red flags on some of my glyphs. How can I fix this?

Never mind. Someone helped me figure it out. It was the starting point (triangle) of the inner b that was not the same.

This is quickly spotted when you activate View > Show master compatibility.

Just hit shift + cmd + opt + R, which fixes it in 99% of cases

Thanks so much both of you.