Mr Bishop and Mr. Suponski both have it right.
Sounds like a wood fit issue. Many times with a new stock or one that is old the wood gets compressed allowing the top tan to come closer to the bottom/ floor plate. Like Mr. Suponski said even just a few thousands off and your single trigger will start doubling. The best way to figure this out is to take the stock off, make a jig that fits at the back tang and floor plate screw (this acts to keep the two seperated the correct distance), then reassemble the gun with the stock off. My bet is everything will function correctly.
I have had to do this to several of my guns and even have gone so far as to drill out the stock and glass bed the jig in place so it acts like a second vertical strut so as to avoid this issue in the years to come.
Another thing to look out for is several restockers will leave out the metal cylinder that goes into the stock at the top tang screw. (sorry I cant remember what this is really called).
Good luck,
John
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