Hi there.
We see you have several tickets opened on our official support platform. Is this question related to the full, or the Lite version of the plugin? Please note that this forum is only for issues with the Lite version, and if you need some assistance with the full plugin, please open a ticket on our support platform.
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 wpDataTables, 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.