L33-37
The function initNXTP has init in its name, suggesting that it should only be called once to intiliaze the nxtpTxManager. However, it can be called multiple times to overwrite the address.
Recommend setting the address in a constructor or reverting if address is already set. Third option would be changing the name from initNXTP to something like setNXTP to better align function names with their functionality.
Note: Same issue is present in initHop and initCbridge.
