I don’t know of a formal word for what you are seeing, but I might just call it a ‘wrinkle’ – When you have an acute angle, an angle less than 90 deg., and a jagged corner pops out.
Your basic options would be to set the path to use ‘Round Join’ in the Stroke palette, or reducing the Miter Limit of the path, also in the Stroke palette.
These options might not work for you, depending on what’s acceptable to you.
Another option might be to draw the outer stroke, then offset the path to a negative value.
I suspect it would just be easiest to Object/Expand the strokes and manually correct them.
Vince
*Please remember to Rate our replies or check Solution if solved. If you get a good idea from the post, consider clicking the Kudos option.