Hi Selina!
Thanks for getting in touch with us!
Let me help you with the troubleshooting so we can find out what is causing that.
It seems likely that is being caused by a theme or plugin conflict. Have you gone through the steps outlined in our Testing for conflicts guide?
Did you happen to notice a difference when deactivating all other plugins or switching to a default WordPress theme, like Twenty Seventeen? What happens if you try deactivating all plugins and switching to the Twenty Seventeen theme together? Do you notice a difference then?
If you see no difference in those conditions, then we’ll need to do some deeper troubleshooting
When coming back, could you please share with us your system information by following this guide > https://theeventscalendar.com/knowledgebase/sharing-sys-info/ ? We’ll see if there is anything strange that would indicate an error from there.
Thanks,
Victor