I think I’m able to reproduce the error.
I also had problems with the favicon, which I had added programmatically in my theme’s header.php.
As far as I know, the problem occurs because the plugin is adding an html input element with id=elex_wfp_custom_price_field_nonce at the <head>, which the browser rendering engine corrects by moving the <body> tag before this input, and thus leaving a bunch of scripts at the top of the body.
If this problem is happening to everyone with the plugin installed, I believe it should be fixed because it’s a clear bug.
I hope the information is useful!
