What's going on here?

[Vintage Iron]

Relatively new here, could use your help...

I have a 3-tap keezer that has 3 varieties in it right now. Cream ale, blonde, and an IPA. For some reason the first two beers mentioned dispense just fine, while the IPA fills the glass with 2" of beer and the rest is foam. All three beers are in corny kegs, and have identical taps/fittings and 10' of beer tubing on them. The regulator is dialed in at about 10 or 11 psi.

Why do two beers pour just fine, and the third is complete (almost) foam? I'm lost.

 

[mongoose33]

How did you carbonate the IPA?

Possible infection, possible that there's something in the post that's introducing turbulence in the beer. Have you tried switching the taps around to see if it's the keg or the taps?

 

[day_trippr]

I'd immediately suspect the small O-ring under the Out dip tube flange.
This is a classic symptom of damage to same...

Cheers!