I was using the editor last night and got thru about a dozen listing. Then it starting adding code in for no reason.
I never changed anything. I use a simple template that I just delete info and change to the new measurements.
But it was adding extra < strong > and < li >. It would be fine until you did a preview or uploaded to eBay. Then it would add the extra stuff.
Not sure if it's working today, but I had to go and edit them on eBay before giving up.