Broad bean confusion

Please help! I haven't grown them before.

I planted some beans in modules two weeks ago, along with some sweet peas. The sweet peas came up and the beginning of the week but yesterday was the first day a shoot had come up on the beans. However, when I picked the modules up this morning, I noticed there was a white shoot coming out of the bottom of each broad bean modules so... some stupid questions...

1 - is this supposed to happen?
2 - if not, why is it happening?
3 - did i plant them upside down?
4 - what do i do now?

Please help a confused girlie!
Thanks 

I planted one bean per 2" module. Do you think I should leave them in these pots or move them on?

Sounds like a root to me so pot them on into deeper pots.

Plants are amazing things - on the whole, the bit that needs to grow upwards will always find a way to grow up. And the root will always find a way to grow down.

Exception to the rule being the upside-down growing tomatoes 

I would leave them in those modules until the leaves emerge and then put them into the ground. In fact you can plant them before they emerge if you are nervous about root damage. The big mistake is to let them get leggy before planting. When you plant them put them in good and deep so that the stem underground suppots the plant lated when it is covered in bean pods. 3 to 4 inches deep.