In the bugs and issues section, there's a thread by NICKBO1 about this happening to him. Have a look. In his case it resolved, but see what he wrote about it. Title has the word Parchment in it. Its from this morning ... Hope it helps!
Edit: that guy in the bugs and issues thread HD the same negative donuts problem as you)
USA/UK Race To Throw Country Into Utter Chaos = TOO CLOSE TO CALL
Once I went to check to see if more neighbors where ready to spy on it came up there and once I went back to my town it was working. Closed app went back and looks like its fine now.
Thanks for the tip Jesfer72, those steps definitely did the trick for me too - looks like checking on your neighbor's town forces it to re-sync your own town, and the whole problem with the parchment and negative donut count went away!
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Edit: that guy in the bugs and issues thread HD the same negative donuts problem as you)
I tried storing it and putting it back in the town but the problem is still ongoing.