If you don't mind, please create staff account (please make sure you grant me to edit the theme, see tutorial here) for this email: firstname.lastname@example.org. I'll take a look.
This is an accepted solution.
The reason is because of "Power Currency Converter". I just disabled and everything is working well now.
Please make sure you install it correctly (please see app installation guide) before enabling it again.
Hope you doing well.