Hello there.
Thank you for reaching out to us.
Issues like this usually occur when there is a conflict either with the theme currently active on your website, or another plugin you have installed.
Can you please change the theme and see if the issue is resolved? If not, then please deactivate all other plugins except for our plugin, refresh the page where the issue is, and see if it is resolved (it should be). If it is, then start activating other plugins one by one, and after each activation refresh the page to see if the issue reoccurred. Once it does reoccur, you will have found the plugin causing the issue.
When you find the plugin (or the theme) causing this, can you please tell us what it is, so we can check it locally?
Kind regards.
