Hi @mahmudit,
I checked your page and the form is loading correctly now but I did see something that is going to cause issues not only with GiveWP but with other plugins as well.
The theme (or some other plugin) you are using is using a different version of jQuery on top of the one that ships with WordPress.
If you look at the source of your page you will see a copy of jQuery from Google:
https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js
And another the copy that ships with WordPress:
https://www.knnkt.org/wp-includes/js/jquery/jquery.min.js
It’s a best practice in WordPress to never use a different version of jQuery than the one packaged with WordPress. WordPress’ version is automatically in no conflict mode, which is what allows most plugins and themes to play nicely with each other in a very unpredictable environment.
Here’s a good write-up on the issue:
https://pippinsplugins.com/why-loading-your-own-jquery-is-irresponsible/
The fastest way to get this resolved is to remove that copy of jQuery from Google.