Can you confirm if you can see the same behavior or broken style while browsing the demo website on your end?
According to the following GTmetrix report, your site responds very slow to load time requests, and this is some JS methods are running with delay.
Here is your benchmark URL: https://gtmetrix.com/reports/www.getkohi.com/8wakac3A
At this stage, I can suggest to read more about optimization and try to make some improvements on your WordPress setup.
Also, using CDNs can help your users load your website faster by serving your static resources in nodes all around the world. However, we are not using this service on our demo website.