This behavior is a result from the caching. Since the polls should show dynamic data, the caching is not suitable for this page. When the request is received, Sitefinity checks if this page exist in the cache - the control properties are saved also in the cache, and if the page exist - it is served. The only way to get around this issue to create a substution asp.net control, containing the polls controls. This way, the page will be cached, but only the Polls controls would not. We suggest you to turn off the caching for this page, if you are not going to develop a subtitution control.
The caching is improved and using substituon controls will be really easier in SP2, which coming in the mid of December. We are also going to prepare a series of blog posts about this type of caching.
IPreleasetimeout is a count down time, after which the visitor's IP address will be released and he/she will be able to vote again.
I hope this is helpful.
the Telerik team
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