Enough infrastructure but still not built

[Ebbingford]

I am seeing occaisonally that a region has enough infrastructure and is building a structure, but the building isn't completed....
See in this save, playing as Britonae. Region of Sabrina. I am building a shrine structure, cost 100, I have 107 in the region and the building isn't completed.

[Pocus]

What is important is the turn number you see on the structure, as this number factors the fact Sabrina is in a province.