DC power supply simulation trouble
You are not measuring the signals in relation to the circuits ground. Your (SPICE) ground point is on the output of the transformer before it goes through the rectifier. SPICE uses the ground symbol (node 0) as it's common reference. 

You need to take a differential reading from your output to the circuit ground (e.g. bottom of C1)
To do this, click on the out node and drag the cursor to the circuit ground (you should see a red and black probe) and release.
You will see the signal labelled something like N001_N002 to signify it's not simply related to your SPICE ground point (wherever you put the ground symbol)  

Alternatively you can move the ground symbol to the bottom of C1.