Could be a spring that wasn't fully seated. Maybe the trigger bar and dosconnector weren' quite lined up properly. Hard to say for sure. Glad it's fixed for you now.
Glock 17 G4 FDE | S&W M&P 22 | Sig P226 MK25 | Sig P226 | Sig P229 Extreme | HK P30 | HK45 | HK USP | HK USP Compact | HK USP 45 TACTICAL | XDM 45 Compact | XDM 9
Daniel Defense DDM4 V4 | Arsenal SGL 21 | ASA SBR w/ Side Charger | Savage Mark II FV-SR | PSA M4 clone
Mossberg 590A1 20" SP | Mossberg 500 Cruiser