City only lasting one turn before starvation?

[Chris P. Bacon]

Hey I noticed this today playing as Macedon, whenever Pulpedeva gets sieged by the Getae, it literally lasts one turn, aka I end my turn, they besiege and as my turn starts again I get a message saying the city will be starved into surrendering unless I attack right away. Anyone know if this is intended or just a bug?

[RollingWave]

I get that as well, I want to know too, is it because the city itself is a net negative in food?

[Dresden]

Is it the only region you own in the province at the time? That could have to do with food, I am not sure.