Holy frack-cow... my Bludgeon's sword is stored inside the cannon-sheath (mostly to save space on a crowded shelf) -- my Drift's sword is held by Blurr (cos Drift is currently displayed in vehicle mode)... haven't noticed any warping yet, but it wouldn't surprise me. That sword bends easily even in normal temperatures. :/
Have you made sure that the wheels aren't obstructing? It helps to transform the trailer in the correct sequence. This might help.