A 0.125 two flute at 18,000 rpm, full width at 10 ipm is an 0.00028 chipload. That is definitely in the rubbing category and I’m sure there was some melting going on.
You can easily run an 0.001 chipload and 0.010 depth of cut on an 1/8 endmill and to hit that you’ll need to go at least 36ipm with a two flute at 18k, single flute - 18ipm. That cut nets under 1 lb of machine force, peanuts.
Make sure to use the least amount of stickout as possible and its good to use a speeds feeds force workbook. Also read about chipload in the E books!
Also do you have photos/videos of the problem?