I dont know if this is a bug  but putting it here in case it is.

A few days ago I created an item exchange... I offered 1umdhleb  sap for 2 liquid vermillion. Today I checked my trades and saw that I had no active  trades, so thought that my offer must have been accepted.

I don't know when my offer was accepted, or even if it was, but  on checking my inventory I see that  my umdhleb sap has gone,  but I don't have any liquid vermillion.

Your help would be much appreciated,  thank you

I do not know why you are not seeing your item exchange but I do and its still active. So the reason the sap is missing is because it is still being used for the exchange.

Thank you, it is showing now...have no idea why it wasn't previously , very weird ☺