Charlott potatoes growing everywhere

Hi Everyone.
I've been growing potatoes for many years but never had this happen before. I set 2 rows of 8 Charlott's at the end of March, covered them in fleece, I could see them coming up, 1 row has come up as a row which I've hilled up the other has come up all over the place nowhere near a row I know they don't always come up in a straight line but they are usually in a rough looking row, this is nowhere near, this 1 row covers the area of 2+ rows  My question is. Can I just put a thick layer of compost over the whole area. I realize digging them up is going to be interesting. Any thoughts or suggestions. I did'nt grow potatoes there last year.
Keith.

Can it be due to some sort of mole or rat that's disturbed them as you didn't grow any pots there last year?