In a bit of rush here, excuses for shortness.
This might be related to this report.
Problem
When applied to (in this case) frame text with character style(s) applied, Contour tool produces unexpected/unwanted results. I behaves alright when applied to 'untouched' text. (clearer to see in the file attached)
— Theme song: Enya/Björk mashup... but I was unable to find any.
Contour tool not working on text with character style.afpub