Why is my softphone set to call on all of my audio devices when I start my PC on Myfone.dk?

This can happen if Myfone is set to run on startup of your PC.

If you have set Myfone to run at startup when you turn your PC on, there is a chance that the audio devices under Call with Myfone in Myfone.dk's settings have been reset, and are now showing All in the audio device drop downs. 

To avoid this, you can remove Myfone.dk from running on startup and manually open Myfone.dk in your browser.