problem wp-polls with multisite

Dear Friends
I have problems with wp-polls 2.72 with multisite.
I install it.
When I activate it, build only tables for first site.
Then I activate it for ever site and solved this problem.
But, When I vote in one site for a question, I can not vote in other sites.
second problem appear after delete and repeat installing and activate it, so I can not vote for any site for first default question.

Best regards

https://ww.wp.xz.cn/plugins/wp-polls/