Digital BW, The Print

Recently I had some prints matted and framed by a profesional framer.  At a later date (three days later) I noticed that the prints were starting to "pucker" away from the back mat.  Can this be prevented?  Is there some archival adhesive that can be used?  Is this a normal occurance?  Any help will be appreciated as this is unsightly.
 
 
Joseph Chandler

[Non-text portions of this message have been removed]