I accidentally went to Siri settings and changed the info to “Cassie” one of the contacts that isn’t me.

OK I've found out the answer myself.

It turns out that although the Maps app can geocode (find the location of) my address, Siri can't. It must be using a different geocoder to the Apple Maps app.

After much faffing, I found the easiest way to fix this is to drop a marker on my house using the Apple Maps app and then add this to my own contact record as "home". This fixes the problem and allows Siri to know where home is. However it then means my address is incomplete if I use it for other purposes or in other apps). The only way round this seems to be add it back and tag it as "address" (NOT "home") as a second copy of the same address. Really messy.

Clearly this is a bug in Siri which will hopefully be fixed one day (I won't hold my breath). I don't recall having this problem in iOS 5, so I think this was introduced in iOS 6.

Don't know if you've figured this out yet, but I finally did today. I've had the same problem for years and multiple phones. Today I opened my contact info and as always, my home address was correct. I clicked on edit and down at the bottom, under my home address was an "other" address, the one maps always tried to take me to. I was able to delete that address and it fixed my problem!

Also - be sure to check if you have many sources to contacts. Facebook, work or exchange contact lists, google contact lists, etc.. can all link and pull an address that's somehow indicated as "home".

The steps to clear up contacts when contacts only exist locally or only in one cloud database is:

• How do I tell iOS 7 which address is my “home” address?