A while back, there was a problem with not being able to see the abilities of creatures in the middle row because they were obscured by creatures in the bottom row (and similarly with top row creatures being partially obscured by the middle row). The placement of creatures was altered as a result, so now the bottom half of creatures (where most stats and skills are displayed) is always visible.
With the most recent major update to the icon system, though, infection icons are now placed in the top right corner of the creature. This means they are often obscured by creatures in rows above, the same way things used to be obscured by creatures in rows below.
It seems to me that everything should be placed in the lower half of the creature, so that all the game-significant information is viewable.