now I`m no expert , but i have had the odd bird that is like yours with wet droppings but is shinning and full of zest ! have been told it has para/cocci/worms the lot but asked the brother who has more experiance than most and was told to feed them beans only and if the droppings don`t get better then get rid ! but it worked , think that some birds just eat the smaller grains and end up a bit watery. hope this helps .