Not sure of the exact dynamics ... but I do know that some Globs undergo "Core collapse"
bringing a lot of stars close together <1 LY.
But Globs are very old for the most part as old or older than our Galaxy, so they must be pretty stable.
This is a good source of Info on all the NGC objects, including globs.
http://www.seds.org/~spider/ngc/ngc.html