After holding a public Feast and hovering the mouse over the "food" part of the city screen, i saw this:

The text "+5 Food from Number of the same Public Ceremony" looks as if a developer initially inserted a fixed string intended as a "note to myself" of what should be inserted here, then completely forgot about it.

For example, after holding another Feast, the line should probably read "+10 Food from 2 Public Feasts" instead of:

The same happens with other ceremonies.  In particular, i saw the same fixed string for Games in the Stability breakdown.