Cant save changes

Hi, I have been using this plugin for a while and its been great. A few weeks ago I noticed I had to click save changes a few times before they would save. Now I cant save any changes.

A while ago I wanted to change some text. I had to make the same around 10 times before it would save.

Today, I have added a new attribute to my website and I want to show it on the compare table. Ticking the box and clicking save does nothing. I have tried many times. it looks like its saving and I get the black tick but nothing saves.

Can anyone help with the problem?

thanks

Dan