In looking at the first and second picture, it looks like the positioning tab under the lug behind the trigger is not seated in properly and off to the left and not under the rear of the trigger correctly. If that is the case, then the trigger will be loose and will also drop down as well as move back and not hold the trigger housing up in position properly. It would also explain the need to move the trigger ahead to get it locked in.
Another question would be..... did you take the trigger apart or do any work on the sear, like dress up the surface???
If you did not try to do any trigger adjusting then the trigger blade should be fine.