Hello Yang Li.

Thank you for your purchase.

There is probably a conflict with the bootstrap.js files.

Please go to wpDataTables main Settings on your wp-admin page. You'll see Include full bootstrap front-end and Include full bootstrap back-end. Disable both sliders, hit Apply and refresh your page.

Please let me know if you managed to resolve the issue.

Hello Iamrichard.

Yeah, there is something we could do by changing some files in our plugin.

However, for that we'd need remote access, so please open a new private ticket, and provide us remote access credentials, so we can log in and take a look "from the inside".

We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course we do not provide login data to third party.

Hello Iamrichard.

Thanks for letting us know the issue has been resolved.

Andre Makatita - 

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.

if you're still having issues, please open a new ticket, and we'll gladly help.