I'm cleaning up my surveys and twice now, once with alchemy, this one enchanting, my log shows 4 surveys but only two achieved and the other 2 vanish from log. Western Skyrim.
Oh ha...
I'm sorry hearing that you all lost so many surveys. If I count the total my friend had who noticed the bug we only lost 4 together.
I basicly provoked getting affected by the west skyrim survey bug so I could share a video with the support and get informations on how to inform the eso community.
Sadly I doubt we get compensated or our lost surveys back. The support said they can't return the lost surveys to us.
Just happened again, I had 3 woodworking and it gave me two and the third vanished.
On west Skyrim or an other location? I try to check all kind of other locations to see if a problem occurs. Vvardenfell, Craglore and Glenumbra are save as far as I can tell.