Hello, dear shezi168.
Please clear all the caches, check this case again and let us know about the outcome.
We have checked and noticed that you are currently using the WP Rocket plugin. Conflict appears due to the WP Rocket cache plugin.
Firstly, you can make a DB backup for your safety ” you can use Updraft Plus “.
Then, please clear all the caches and let us know whether the issue persists or not.
Please, make sure that it does not store a strong cache and that the webpage where the poll is located doesn’t become static(HTML).
Check whether deactivate PHP cache is ticked from the settings of the cache plugin or not.
If yes, then please deactivate it.
Please clear all the caches, check this case again and let us know about the outcome.
Thank You.