Disappearing carts


Ive been analysing my store and believe we have a case of bug causing carts to empty/disappear

I can see a user has a cart / goes to checkout as normal on my analytics and this shown on carts on cs-cart admin panel

Then suddenly the users cart goes from the admin panel. I know people can clear carts, but this is happening at a disturbing rate and typical user behaviour is to just leave the site and not to go to back to the cart and press clear cart

Is there anyway we can isolate this? Has anyone else had this issue before? Ive tried testing so far but have been unable to replicate