Can you only get units for discovering all species from only single planet per system? I find all animals in two planets in a system and tried to upload both to get nice big sack of units. It turns out when I upload one I can't upload the other. What the fuck? :(

I had this problem in my first system also. I'll see if it happens in the second as well.

My "previous" save was just before I discovered last species in second planet. I load that save and upload 1st planet, find last species from 2nd and I can't get units from those. So, it has got to be units from single planet per system, or something like that. God damn :(

Except it doesn't advance the achievement ether which really seems like a bug to me.

Nope, I've gotten the full species from 3 planets in the same system so far.

I do think there is a bug related to starting collecting species on one world, going to another, getting some, going back to first and finishing (actually, I would bet several bugs).

All the planets I have done have been get 100% without ever going to another planet and collecting species. Thus far no issues.

Same here, no issues in 4 systems but I may have been doing them in order. I hope the order doesn't matter.

You might be right about that bug. I've been travelling between planets and scanned stuff in no-order. In my current game I have not uploaded anything, and I'm gonna hold doing so until bug is fixed :p