Absurdly low replenishment on stacks as Belakor?

I'm playing as Belakor and some of my lords seem to have absurdly low replenishment. It's Festus and Sigvald that stand out. They are in allied territory and normally I seem to replenish a pretty good chunk each turn but they each replenish a tiny sliver. They have armies with their mark and have high authority for that God. The regions have high Chaos corruption (generally Undivided). Not sure what's going on.