Take heart. You are one of hoards of people who cannot spell potatoaeoes.

Possibly the way you are storing them, possibly they were actually blighted when you harvested them... As you can't reply to questions it is difficult to have a dialogue with you Guest

This sounds like blight infection, Guest. Did the leaves go blotchy earlier? The potatoes are not edible and should go in the dustbin. The ground where they grew is likely to hold blight spores and should not be used for potatoes or tomatoes for three or four years.