Mostly all the glyphs that are generated by scaled components, having this problem (attached Images)
What version of Glyphs do you have? And do you have any TrueType hints in those glyphs?
using the latest updated Glyphs Version 2.4.4 (1075)
I used auto hint option while exporting. Not manually hinted.
Then you might need to check the path direction.
I had checked the path directions. Still faced the same problem. Later I had to decompose those components and so it worked!