Question on Country Maps (Little Upsilon)

I Keep setting my country to display all factories, which it does until the month turns over, then i find lots of them not being displayed on the map. Now i know that objects are not painted when the map is very crowded, my mine is not all that busy, especially compared to other countries around, anyone have any ideas on the cause?

No .. I've had settings not take but never any that displayed change.

Its not a big deal, map just looks better if all corps are displayed, they just wont stay that way