If I remember correctly, this exact same thing happened on the Ambassador bridge when it was first released.
Anyway, when starting on the Generations bridge, your viewpoint is in the tatical controls, behind the command chair but infront of the guy at tactical.
You are actually standing in the tactical controls.
Also, when walking forward, I couldn't walk very far infront of the command chair, like there was some invisible thing blocking my path. I could walk around the rest of the bridge just fine.
Sounds like an animation problem. Well done on the awesome bridge though.
On the Excalibur bridge, I end up starting stuck in the middle of the floor infron of the command and XO chairs.