I have "inherited" support responsibilities for an OctoberCMS sites that uses the Contact and Form Builder plugins. All of the forms do double-POSTs when submitted. I have spent days pouring over the code to figure out why, to no avail.

Last weekend I created a fresh install of OctoberCMS with the newly repurchased Contact plugin as a baseline, and created a simple contact form, with no code from the production site... sure enough, it also double-POSTs!

The only mention I see in the forums about 2x POSTs is a warning about accidently duplicating the {% framework %} entries, and it's not that. I'm a full-stack developer, but fairly new to this environment. Any hints, nudges in the right direction, or dope-slaps are welcome. I'd even consider contracting with an expert on this if I can find someone whose willing and able to peek 'under the hood.

I look forward to any assistance/replies.