I have the white gull alcohol recipe in my inventory, i only needed mandrake & cherry cordial to complete the list.. after purchasing both mandrake and cherry cordial from a shop keeper, the white gull recipe disappears from my alchemy list... if i drop one of the 2 cordials the recipe appears again, then is removed if i pick the cordial up.. need help

Check your filter settings. Sounds like you have the filter turned off for "all components present". This makes it so that anything you have all the parts for disappears from the list.