Growth on Peas / broad beans?

Hi,

I have some peas growing and coming into flower... However they are all of 5 - 8 inches tall!  I have no idea as to what type they are - I bought them loose.   is this correct for them to be flowering when they are so small? Or are there some types that produce peas on tiny plants?  They've taken a while to get going once they were planted out and were looking rather sad at one point after being hit by a frost...
  
Also, Broad beans seem to be the same..  I must have bought dwarf plants i think...  flowering well now but they are only 1ft tall (at best).

Or have I got something that's stunting the growth?

as I posted a few days ago ................ my sugarsnap peas have flowered and podded up already and only about 2ft high, they are usually waist high.
I've picked them all and they are headed for the freezer, but the yield is very much lower than previous years, and that's despite watering quite well (or so I thought) 

Now have to decide if it's worth growing some more, or to try something different