I have successfully login to your site now.
I just figured out the issue is not from the Template override we wrote. the issue is from J2store itself. will you please kindly request J2store support regarding this issue, please
For your clarification kindly check the attachment below
https://monosnap.com/file/tkBJtv5jlKaViOTmsVioNfmbTlfpMT
In the screenshot above I have removed my code which we override J2store core code. if anything wrong with our template code after removed our code it should work perfectly. in this case, this not working so the problem might be from J2store. while creating a ticket inform them after removing the template code. the same problem came like that.