Is my copy of Tomb Raider: Underworld on PS3 broken or am i being slow?

In Southern Mexico: The Midgard Serpent (level 4, part 3) you have to go through some corridors and down stairs on your motorbike. Then you apparently reach a pit where the bridge is raised, you use this half of the bridge as a jump to clear the pit. However, in my copy the half of the bridge is down. Has anybody else had this problem/do they know how to fix it? Thanks