CRJ-900 First Officer reported during landing the aircraft handled as if it had a flat tire. After taxiing to the gate; it was found that no tires were flat; but the left main landing gear assembly was not straight and was rubbing against the right side.

Narrative

At ZZZ1 I FO (First Officer) completed the walk around and found no issues with the aircraft. During taxi out both me and the Captain did not notice any taxi abnormality nor did I (PF) notice any odd tracking upon takeoff of [Runway] XX in ZZZ1. Flight proceeded to ZZZ without incident. Arriving into ZZZ we were given XYL and descended normally and had a fully stabilized and configured approach at ZZZZZ [intersection]. At 1000 ft. AGL Captain (CA) announced 1000 ft. stabilized and I clicked off the auto pilot. At 40 ft. call out I brought the power to idle and began my flare. Under the 10 ft. call out we ballooned slightly and I felt the main gear touch down normally. However; when the spoilers deployed i felt the aircraft lean to the right as well as track to the right and give a slight side to side motion. Upon touchdown I had also opened the thrust reversers but kept them at idle in order to maintain directional control in case it was asymmetric thrust reverser issues. As I established directional control with the aircraft I immediately thought that the control behavior of the aircraft pointed to a flat tire. I called that out to the CA stating 'I think we blew a tire on the right'. CA took controls as we slowed through 90 knots and pulled off on [taxiway] 1. I asked the tower if they noticed and tire debris and the responded no. It was at this point both me and CA agreed that it was just a single flat tire on the right MLG and elected to taxi to the gate. During our taxi to the gate on Bravo another aircraft behind us noted that we were dragging a tire. We had ground ops verify and they noted that the tires were not flat but that we had a slight crab in our taxi. We pulled into the gate suspecting issues on the right gear but upon inspection I noticed that in fact the LEFT MLG was actually pointed inboard and causing the right MLG to scrub. Also worth noting the LEFT MLG was fully extended and pushing up. Causing a lean to the right.