It doesn't make sense to me that a magical spell effect would be non-dispellable, so I think it's more likely that your characters attepting to Dispel are simply of a lower level than the Illithids & Umber Hulks. Read the descriptions of Dispel Magic and Remove Magic and you'll see what I mean: A low-level (let's say he's Level 13) Mage attempting to Dispel the Stun caused by a Level 17 Ulitharid would have only a 10% chance of success.
This can be quite a shock to players used to the BG1 system, where a single casting of Dispel Magic would automatically dispel everything. Wheeee! Everybody's an Inquisitor!
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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