In the voting module, I will tell you the specification when only one choice of voting can be done.
Suppose you voted No from the same NEM address and voted Yes on a later date.
In this case, the one that voted first is treated as valid in the current ournem.
For formal specifications, all votes from that address will be invalid.
Please add this specification.
By the way, if you vote multiple times only for Yes, or only for No, the vote is valid, but the count is 1 time.
This is why there is a difference in the number of votes and importance of NanoWallet and ournem in this vote.
I am one of the Voting module creation committee.