The Strict-Transport-Security header was added to an Apache include and Apache restarted but the SSL grade is still not an A using something like SSLLABS to test.
SSLHonorCipherOrder needs to be turned on in order for the server side settings to be used instead of the client side.
Apache documentation for reference can be found at SSLHonorCipherOrder Directive
Modify the include file that likely had the header added at
and add the following
Then restart Apache with