That's a bug, plain and simple.
Charisma does (and should, and always did) have a slight impact on Charm, Mez, and "a resisted Lull's aggro chance". BUT, for Charm and Mez, CHA is not as big of an impact as the mob's relative level, or, the mob's MR.
-Greens should very often stick around for the max duration.
-Light blues should generally stick around for awhile (no guarantees though).
-Dark blues can stick around for awhile, especially if their MR has been lowered. High CHA helps quite a bit here too and can make all the difference over time.
-Yellows will seldom stick around for long (or will outright resist the cast) unless you drop their MR through the floor (high level resist debuffs), *and*, have a very high (175+?) CHA.
-Low reds will generally just resist unless you crush their MR first, and, have near-max CHA. It *is* possible even here to get a full duration charm, because it has been done...it's just very rare.
To summarize, Charm resist and per-tick break chance rely on the following factors, in order of priority...
1 - Mob's level relative to the caster (hugely important).
2 - Mob's MR (very important).
3 - Caster's CHA (somewhat important).
I can provide old (public) posts from the original devs if it would help - although no implementation details (or hard numbers) were provided of course.
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