I ended up downloaded a WP form plug-in to replace this one and it’s working great.
I believe I am having the same issue as you, or very similar. I’ve adjusted a theme to look how I want, but every time I hit SAVE, it wipes everything to bare bones even though it tells me my changes have been saved.
I don’t think that is the problem. Chrome 61.0.3163.100 is the only place I’m seeing the issue. How am I suppose to edit it for that version of Chrome only without it then messing it up on other browsers?
Looks like it may be the newest version of Chrome that is jacking it up, as we can’t recreate the issue on any of the older versions of Chrome or other browsers.