Duplicate Address On Line 1 & 2 Frequently

So over the last year or so I have seen a tremendous number of orders (about 10-20%) come through where the customer has their street address filled out the same on Line 1 and Line 2. Never was an issue a few years ago. Not sure what is causing this since it happens if paying with credit card on the site or even when using PayPal Express which they are bypassing cart checkout. Anyone else seeing this?