I'm not familiar with the crossbar area (where the ball ends of the strings are attached) of the Guild tailpiece, but based on my experience with other archtop tailpieces this is a problem that's more common with the low E and A strings due to the thickness of the wrap/winding at the ball end. As a first fix I'd make sure that the ball end is properly seated in its receptacle and hasn't popped out/wedged itself where it shouldn't go before tuning to full pitch (FYI I have to do this regularly with both my Godin 5th Avenue and Carlo Robelli ES-5 knockoff); if the problem still occurs and you bought it brand-new, IMO a call/e-mail to the Guild customer service folks would be in order - you could probably fix it yourself with a file and some time, but why...
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"Mistaking silence for weakness and contempt for fear is the final, fatal error of a fool"
- Sicilian proverb (paraphrased)
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