Using SW'18 SP3, I have modeled a very simple sheet metal "box" by extruding a 10" square 2.5" tall, and Convert to Sheet Metal.  The material is 0.125" thick with matching bend radius.  When I move down and attempt to change the Auto Relief Type, SolidWorks acts strange.  The selected relief type is not reflected in the graphics window.  Selecting "Rectangular" acts as a "Tear" and even makes the Relief Ratio input box disappear, Where as selecting "Tear" acts as a "Square" and even offers me the Relief Ration option.

I've tried refreshing, reopening, rebooting...  The problem doesn't happen every time I convert a solid to sheet metal, but it is persistent to that part, once it has happened.  Nothing seems to correct the error, once it has happened.

I searched the forums and found this post from Nov 2014 - https://forum.solidworks.com/message/464641?q=auto%20relief

I have to wonder if this bug has been around since then?

~Kam