If you have included your personal/office web address in your Matrix header, make sure that it does not begin with https://, as shown below:
If it begins with anything other than www, it will not open up properly if someone clicks the URL from within the header.
You can modify this field from the My Information section of Matrix.
Go to My Matrix> My Information. The Office Website field is down towards the bottom of the screen. Remove the https:// at the beginning of the URL:
Click Save when you're done.
You can verify the change by clicking the Header & Footer tab at the top of the same screen: