Cronometer adding 1 Calorie a day for Alcohol?

I had a beer on Sunday which I added to my dinner. Since then, for the last 3 days, Cronometer is adding 1 Calorie of Alcohol each day. Not a big deal as far as the calorie count goes, but clearly should not be there.

I deleted my beer on Sunday just to see if it would change anything, and then Sunday also had 1 Calorie.

Weird.