This appears to be a common problem from reading posts on here. I have exactly the same problem and paypal are not able or willing to do anything about it. Every time I use my account a new copy of the delivery address is added to the list of addresses in my profile. These addresses are not visible in the editing window of my addresses but only in the first page of my profile when clicking 'show all addresses'. The annoying part is that, as the original poster, I have some incorrect and incomplete addresses in this list and paypal seems to automatically use one of the incomplete addresses when it automatically fills in the address for any purchase I make. I am unable to change this automatically entered address at the checkout and have to resort to phoning the seller to check that the correct address has been supplied to them. In most cases it has, even though an incomplete address shows where it says check your delivery details are correct before clicking continue. Paypal says just accept the wrong address and change it after by reviewing my purchase. This does not appear to be possible most times I have tried to find a link to do this on the purchase confirmation page. This is a real problem that needs fixing.
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