Your website produces a SSL/TLS warning. A warning from the SSL/TLS scanner does not indicate a direct vulnerability, but highlights a potential issue that needs to be manually reviewed.
For any cookie related issues, please read the following article: Enable Secure Cookies
If multiple headers are overlapping headers are presented, the browser may chose to ignore some of the presented information. Make sure that the sent headers don't overlap and don't contain contrary information. For more information on Security Headers refer to: Enable Security Headers