http://www.thesmarthomehookup.com/wp-content/upl…8/08/hookup.jpg
The Shelly I am having problems with was wired exactly as shown above. However, I've replaced it with another Shelly 1 and it works just fine. The Shelly I am having issues with is on my test bench now. I have it wired the same except I dont have the "SW" or "O" wired anywhere. I just have the line voltage going to "L" and "I" and am measuring the voltage at "SW".
I did measure the voltage at SW of this device when it was hooked up to the lightswitch as well and it also read ~65V.
I took another brand new shelly 1 and did the same measurement and got ~5V at the "SW" terminal.
EDIT - Power supply is an extension cable stripped down and plugged into an outlet.