Customer order returns address incorrect

We've just noticed that all our returns after June the 1st are going to our registered office address and not the default return address we have set.

When I check the manage returns section all the return addresses on return orders changed after the 1st June but we haven't changed anything. When I check our default return address through settings it's the correct address. FBA returns still come back to the correct address, just our customer returns going to the wrong address.

Anyone know where else I can check or is anyone aware if this is a site wide issue?