Did you try and stick something down there and try and move it? It could be some sort of construction debris. When we purchased our unit, I looked down the toilet and there were 2 pieces of trim in there about 10" long. It was a b*tch getting them out. As stated above, there shouldn't be anything down there.
2012 Eagle 320 RLDS
2012 Ford F-250 Crew Cab FX4, 6.7l PSD
3.55 E-locker, Timbrens