Oracle Address Search - Random Zip Code

We've enabled Oracle address search that returns a suggested address as you're typing:

However, if what you've typed in isn't entirely correct (say you have a different city than what it returns or a different county), you can click on Edit Address and edit the address. An odd thing happens though when we use the zip code field. We can update this and no matter what we update to, it always defaults to Holtsville NY. We can then re-update it and it uses the value we enter, but what could be causing that?

Before entering the zip code:

After entering the zip code: