My only problem with the first/one magnet bot is that it catches nothing and seems a bit pointless. Maybe it's positioning could be improved so it caught a few things and not seem like an empty upgrade just to get you to the second magnet bot...
Rethinking this: This isn't a BIG problem, just a slight annoyance. Not sure it's worth putting a lot of effort into changing it's behavior - maybe give the first bot a lower orbit until you get the second one?