I'll jump onto this one, since it is similar. I'm running K2, Mining Drones, and Factorissimo, but I don't think that matters too much. I'm starting to expand, and decided to setup monitoring for when a resource runs low, to help find my bottlenecks. I found my coal was low even though it shouldn't be, see the attached screenshot. I tried removing the low depot, as that ore patch was all dried up, but it didn't help. The number being read by the reader is jumping around all over the place. Right now it is stuck on 3.8k when the depot has 5k. I wait a few seconds and it drops to 2.6k. Very strange.
In the Road networks GUI, the number in the reader matches the Contents tab, but not the Supply depots tab. I have 16 readers setup, and only 4 are accurate.
I checked in the Mod settings, for "Transport depot update interval", and it is set to 60 (which I assume is ticks), so that should be once per second, so that shouldn't be the issue.
https://i.imgur.com/FVwvuUZ.jpg