First of all, I do know that when a potion is not successful I lose the ingredients and sometimes the cauldron- this is not what happened.
I had two recipes that I wanted to try and started a potion, in a cheaper cauldron. I then went to start the second potion in the most expensive cauldron, not realising that it cost to have two brewings happening at the same time.
There was a popup asking if I wanted to pay. I clicked cancel- and I am very sure I did not hit proceed by accident- and the site redirected me to a payment page anyways.
I didn't want to pay, so I hit the back button, and I ended up back on the brewing homepage saying "you need to purchase a cauldron to start a brewing" or whatever it said. I was super confused, so I went to my chest- the ingredients that I had placed in the potion I didn't end up starting to brew were gone, as was my cauldron.
In summary- put ingredients in a brewing, but didn't start it; was redirected to a payment page despite hitting cancel and now all my ingredients and cauldron are gone.
Customer support service by UserEcho