I don't want to speculate, but I would see this as a problem on the part of the program that records the votes. It's been here several times before.
If you have a favorite, write the photo number in the comments. I'll include it in the overall results.
i am a bit biased towards sky photos but something about #5 speaks to me.
so #5 is my choice for this month.
Thank you for your vote. I will adjust the poll results accordingly.