shortcodes only working in Chrome

I’m having some difficulty getting the plugin to work in browsers other than Chrome. For example, on our registration page, I have a text block containing the shortcode [seplog_register_common_panel] … this is working as expected in Chrome, but in other browsers when users enter their registration information, the form clears but stays visible, and the activation code field never appears. I’m wondering if I need to use a different syntax to support the other browsers? Not sure if it’s relevant, but when I try to register in Microsoft Edge, the console returns a number of HTML1500 errors “Tag cannot be self-closing. Use an explicit closing tag.”