Three things to check, and I'd check them in this order to save extra work.
1- Check the over-travel screw in the trigger itself. If it is turned in just a little too far this can happen.Take it completely out and see if that solves the problem, Then put it back in with loctight and set it so there is still a bit of overtravel.
2- The sear spring mentioned above.
3-You may need to check out the trigger/linkage. It may have been slightly bent where it attaches to the trigger, when it was removed/installed. If it is bent ever so slightly it can be tight in the lower frame. Take it apart and see if the trigger mech slides in & out freely. it should fall right out the back if you tip it up. You may need to bend the trigger left or right , up or down. You should be able to see where it's tight if this is the problem.
Hope this helps.
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