Solved Ultimate Footer breaks/disappears on save

Your site footer looks fine to me.

If your issue is related to pop up new tab wipe out problem & you have Wordfence installed, then you can try the below:

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After opening the custom header style in Divi Library, straight away click to edit it in frontend / Visual Builder. And in the Visual Builder, try to go around clicking open module settings, etc & see if there's any popup from Wordfence to whitelist the action. If no Wordfence popup, then try to refresh the Visual Builder page & test again.

Previously there's a member having such issue & going to the Visual Builder somehow will show Wordfence whitelist popup. Hope that it works for your case too. If not, you will need to contact official Divi support about it: https://www.elegantthemes.com/members-area/help/

This is a conflict between Divi Library & Wordfence. Not our plugin.
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If the above doesn't work, another thing you can try is to delete the below code module (named Hide Header & Footer on Visual Builder) & save it:

 

That looks weird. Never heard of such issue before.

Kindly check your PM. Will need login credential to check further.

 

Seems like your custom footer in Divi Library is corrupted. It should be a layout type, but not module type. That's why it's working weird.

I recreated your footer layout for you. It's named: Cloned - Epic Grand Valley Footer