I have multiple depots that are refusing to deploy more than around 40 drones at a time. Issue seems to involve all vanilla ores as all of my depots are doing this. I have tried to pick them up and place them down again but it didn't help.

https://i.gyazo.com/98fb17bcd1a93d003d6ac5fa75211197.mp4

Can you provide a save game?

Yeah, here you go.
https://drive.google.com/open?id=1BZWqw-6nvPxs0xevdL5JfXJG-tR9dKo0

Ok, I changed the logic which decided how many they should spawn, so it should work smoother now for you

Okay, I'll give it a try. I noticed something else that was weird on that save. If you look at the bottom right copper mine the drones seem to be skipping some of the ore and going to further away ones.

After some brief testing with 100 drones in the depots it is way better and they now deploy around 95-98 drones per depot. Thanks for the quick fix.

The going go the wrong ore was some sort of Lua issue with iteration order, which resulting in a sorting like this:

https://i.imgur.com/cNm6JBk.jpg

I changed and optimized the sorting in a recent update, so it sorts like this:

https://i.imgur.com/9erQ2Pt.jpg

You will need to reset the recipe to make the depot resort all the ores

Resetting the recipe worked. Thanks for the quick support and fix.