I've been getting the occasional quality loot from data collectors, which I noticed was coming from quality spawns of Advanced Circuit / Gunpowder / etc enemies. Unfortunately, the quality loot is not automatically marked for deconstruction / pickup by the robots. Normal quality loot is just fine. The Quality for Biters! mod by suumani can make any enemy higher quality for extra fun. Quite possible it's something else causing this, but it's my lead suspicion. If so, this also seems to be a cheap way to get higher quality ingredients, as higher tiers of evolution have improved chances of spawning higher quality enemies.

Fixed in 0.4.5 by always marking them for deconstruction, regardless of if there's a roboport in range.
Also, as a note this version also decreases the chance for quality items from 100% as that was very unbalanced lol. (Looking at you low density...)