Cab corner install question

[Island Medic]

ok look at the picture below. This is a 14 gauge chunk of metal that was between the cab corner support and the cab floor. Is this factory? IT sure doesn't look normal to me. This was in the passenger side and there is something similar in the driver side. See second picture. The yellow arrow is the floor. The red is the weird chunk of metal, and the blue is the cab floor support. I really hope this is not factory because I didn't put it in the passenger side.