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Ammonia has very low impact if not at all on ORP while cycling.
https://www.reef2reef.com/threads/orp-during-cycle.229158/#post-2664341
I did cycle some tanks already and never got negative numbers while cycling.
ORP during cycling can be around hundreds on first days and then it rise slowly but never negative numbers.
If you still see negative numbers after checking all possible issues then better contact GHL for support.
https://www.reef2reef.com/threads/orp-during-cycle.229158/#post-2664341
I did cycle some tanks already and never got negative numbers while cycling.
ORP during cycling can be around hundreds on first days and then it rise slowly but never negative numbers.
If you still see negative numbers after checking all possible issues then better contact GHL for support.