There is one instance of this
The collectFees(...) function of the UTBFeeCollector.sol contract verifies signature without a deadline.
Secondly there is no check to ensure the recovered address is not zero address. This is because ecrecover can return address zero for invalid signature.
Lastly there is no use of nonce for the signatures:
Implement deadline to signatures and also add address zero check on the recovered address. 
See EIP712: https://eips.ethereum.org/EIPS/eip-712
