I discovered just by accident, that it is possible, to play the same level two times in parallel.
I am now in my 1st SAsc at that point, where I wish to open two levels in parallel. To get the needed AP more soon, I decided to play one of the seldom multi level powers. Accidently I selected the same level, as that, from which I selected the power.
I was first angry on me (and a possible bug allowing that), but than I discovered, that I am really playing the level two times.

The only way to play the second level is, using the menu button at the top, as clicking on the pictogram for resume, opens always the first instance.

Please share a screenshot with us