Bit of a strange question, I bought a packet of tomato seeds (Plum Roma) and germinated them in the propagator, I then transplanted them into individual pots when they were a couple of inches tall. Now they are a bit bigger I've noticed that I have more than one plant in some of the containers. Do you recon that they were just late germinators and there was another seed in the pot that I didn't notice, or is there something that tomatoes do that means they might grow another one next to them?

None of this is really a problem, but it is a bit weird!