"Warning increment Cache size" PC

Was manually caching a small prairie city . Downloaded 85% then came up with this warning and froze up for maybe 5 minutes, Then asking me if I wished to proceed with the download in the menu selections for that region. Repeated attempts repeated the same cycle. I have 30 GB dedicated to the manual cache and as far as I can see in the " Cached regions" menu I’m using less than 20 MB. What’s going on here ?

I have now tried to delete the Winnipeg region and start that one over…but it won’t even delete it. This is not a pc issue. It’s something that hung a hard left in the sim !