I'm hoping one of the mods will see this and respond but anyone who knows the answer can chime in:

Can moderators 'see' how each of us has voted in these polls after we have voted? If ten people have voted in a poll do the mods have information as to who has voted and which option each voter has chosen?
Since some poll votes have been changed I've assumed that moderators can tell how we have all voted. Is my assumption correct?

No.

We can only see how many votes have been cast for each particular choice.

Anytime a request for a vote change is made, I keep the message until the poll is closed. That way if a vote is ever disputed, I can show who changed their votes. Plus, I make a post in the poll stating the vote change (but not the requestor).

If I notice the same person(s) requesting their vote to be changed in various polls, I will investigate it further.

Thanks for the quick answer!