The hammer spring legs should straddle the trigger, one on the pin on each side of the trigger.
The legs need to seat into the groove(s) on either end of the trigger pin. The trigger pin should have a groove on one end or both ends. That is what keeps the trigger pin from moving side to side. Get a super bright light and you should be able see the leg(s) of the hammer pin, and at least one should be in a groove on the trigger pin.
Were both pins walking?
Which pin was walking?
Here is a Geissele trigger pin. One leg of the hammer spring must be in the groove indicated with the arrow. The other leg of the hammer spring must be on the pin on the other side, even if there is no groove. You don't use the center groove for the trigger. The center groove is what the hammer uses to center on the pin, but it sounds like you are GTG with the hammer.
Attachment 64107
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