Your tank is not all the way back down on the frame mounts. The 2 channels are sitting on top of the rubbers instead of the rubbers being in the slots. When putting it back where it belongs be careful not to pinch the vent hose. You will have to unbolt the back of the tank again and pull it back so you can drop the front down about an inch or so and then slide it forward again so the rubbers are in the right place in the tank slots.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
| 
