I don't see any contradictions.
In Chapter of Gita, the Opulence of the Absolute,
Krishna says he is Shark, himalayas, sama veda, punishment etc...
Krishna explains at times how he is the Self from where every thing originates, at times, how he is the different players of the world.
It is done for convenience and easier understanding.
Is it a contradiction within the Gita that Krishna is the Self, but also the elements?
No it's not.
I suggest you getting Yoga Vasistha by Arun Mandhava.