First gear didn't ratchet all the way down, clutch not fully disengaged, sticky clutch plates, and more. With good firm pressure the bike should have come out of gear with the clutch problems, but a brand new ratchet mechanism can act like that if you aren't firmly engaging your gears. You can be in gear and not fully ratcheted at the same time.
Has the problem come back at all? Word of warning. If the clutch isn't disengaging you'll know it when you start the bike and/or first put it in gear. Hold the brake down just in case.
2013 V Star 1300 Deluxe
OEM Tall Sissy Bar
Memphis Shades Fork Deflectors
Bridgestone Exedra Max Belted Tires
Baron's RSTD 7308 bar