I've been noticing my munition wagons often take awhile to fill up. I have excess shells, so I don't think it's a shortage. When the wagons are empty, I shuttle them back to a depot (usually a bigger city). They often have to sit for a few turns before filling all the way up. The problem seems worse in Eastern Europe than Western.
Is this just a function of the supply system "pulling" supply to different areas? Is it working as intended? Admittedly, it hasn't really been a big issue; I just buy extra munition units and constantly rotate. Just wondering if there's a more efficient way for me to do this.