If you can not login to xenforo then your issue has nothing to do with our application.
I am not sure what you mean by you had to remove something but I registered an account and you do not have a gallery issue. You have a xenforo issue.
I see this when trying to login on the forum
Pakistan Defence - Error
This action is available via POST only. Please press the back button and try again.
Now I seem to be logged in but your site sent me no confirmation email to confirm my account. I seem to be logged in but am not confirmed so I can not do anything.
Likewise it does not look like you have the gallery plugins installed because your navigation is not showing or any of the other stuff we add to xenforo. I assume this is because you have yet to be able to login to xenforo.