Dear Tushar,
Firstly, There seems to be some malfunction in the theme.
I created a test post in order to check the issue (
weldwell.com/test/). However, whatever text I add, with or without the animation classes.
Secondly, you can see the widgets and animations added in the "Live Editor". No idea why this is happening. I suggest you to contact Theme's support for this.
Finally, When I tested the Page Builder, I found that Animation are working fine when added to
Widget Styles > Attributes > Widget Classes
While they are not working while added to Animate It Classes box. The reason here might be the animated classes box is not added by Page builder as it is a custom feature built by us. However, I think this simple workaround of putting the animations in Widget Classes should work fine for you.
You can check that the animations are working by using the Live Editor
(Please login to the back-end first):
http://weldwell.com/wp-admin/post.php?post=4138&action=edit and click on Live editor here.
Please let me know if this works for you.