Petite Cake buff not producing additional balloons
Before:
https://image.prntscr.com/image/U9YH..._h2A__lYCQ.png
Production about to tick over:
https://image.prntscr.com/image/vBhZ...XRlwJjqwTg.png
540+18+18+18 should give a total of 594, but...
After:
https://image.prntscr.com/image/nl3G...RsyPTiUttA.png
...which is what the hall would have produced if unbuffed.
EDIT
I stopped and restarted all three during the following cycle of production.
576+18+18+18 should give a total of 630 but...
https://image.prntscr.com/image/Fxox...zXN4kyR2Vg.png
Again, it is as if the buff was not there.