BUT not when I input my number but does when I use a neighbours number??
When you say "number" do you mean "phone number" or "house number"?
If you've been checking by phone number, it's worth trying the Address Checker too (note: not the postcode checker!) The address checker lets you enter a postcode, and then select a specific address from a list.
In the event they've listed your property with more than one variant of the address, try them all.