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Hard to say what is under the paint that is causing the primer to "wick" the stain through the film of the primer. I would suggest using a shellac based primer such as Cover Stain from Zinsser. It stinks to high heaven, is difficult to use, but is the best defense against stains bleeding through. I have had this happen to me numerous times in 33 years & it's just best to use the Cover Stain and be done with it. The more coats of latex primer you put on the wall, the more the stain is gonna "wick" through.
 
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