We have installed plugin on our local server and it is working fine.
May be you have installed other plugin for tweets that may cause trouble.
May be you have other plugins installed which are causing trouble. Please try deactivating all your plugins one by one and activating AI Twitter Feeds plugin Or you may have included js files without enqueue scripts to your site which may cause trouble.
If you still find any difficulty please provide us your website link and brief description of issue, so that we can help you.
Thanks & Regards,