When 'standardize all return addresses' is selecting during an NCOA run, the standardization is incorrectly updating the case in certain cities and addresses.
The standardization is writing the wrong case - for example, it is changing La to LA in the city of La Crosse and address of La Crosse St.
This has been resolved as of 6/13/2017. AddressFinder services run after that will not encounter this casing issue. The next time you run AddressFinder the case should change back to the correct way. If you notice incorrect casing after this date, please contact support and reference this article ID.