Fan in (UK) fan oven scraping against heating element
It sounds like the problem might be with the fan. You may need to access the fan from the back (outside) of the oven; or maybe to access the fan you would unscrew the screws circled in red.



Edit- If the fan is not the problem (and the warranty is expired) then I would order a couple more of those retaining clips. If the clips don't come with screws, then you could probably use high temperature screws (like for stoves).

Edit2- Manuvering the element while is it hot and pliable would be the best way to avoid cracking it. Generally speaking, this is kinda dangerous; if you do this you should be prepared. Have a friend ready to call for an ambulence. Of course you should wear gloves. And if you don't get hurt, you might still need to order a new element. 

But (that being said) you could try heating it up and manipulating it with a couple pairs of pliers or channel locks.  After repositioning the element and allowing it to cool off, you would then intall the extra clips.

Edit 3 if the price for the element is cheap, then I would get another element rather than try to fix the old one... or if you tell them it warped after a couple weeks, they might give you a new one or some kind of discount.