In your screenshot I can just see the gouge report. The collision appears to be the shank of the cutter with the workpiece. Try a temporary tool swap, changing the flute length to almost full length of the protrusion and see if you get the same gouging.

You may have left too much rough material for the 3mm flute length to machine. The toolpath has no way to check that, it's just going to guide the tool around the part and keep the tip out of places it can't machine. That doesn't mean it's not going to rub if the flute length is not long enough.

I'm taking a big guess at this point but that's the direction I would start based on just your screenshot. I have a few other ideas of what might be causing this but it is really hard to tell without a file. I understand your upload predicament but try an imaginary extra long tool first and post another screenshot if necessary.