Unit support costs not updating?

[playshogi]

View attachment 101863

I don't understand what the popup is saying.
I'm playing at Noble level with Vassalage (7 free units according to the civics screen. Also, have 4 cities with total pop of 20. 1 settler, 3 worker, 1 work boat, 4 archers, 1 warrior, 1 spearman, 2 axemen, 4 swords, 1 galley. Total of 18 units, 13 military.

Shouldn't the popup say ----
0 gold : Unit cost for 18 units (free support for 23)
? gold : Military unit cost for 13 units (free support for (at least 7))

 

[playshogi]

Can anyone verify if this is a bug or I just don't understand unit costs?