What does the content in "My Couch" mean?

It shows your actions concerning your portfolio.

That means:
"My Couch" shows your Asset Slip´s inbox. Every incoming asset slip is listed to the price it came in. However if purchased during ICO, if purchased on the exchange AND your not sold Asset Slip, you tried to sell on the exchange that you got back from the exchange because you didn´t sell them (for any reason).

"My Asset Slips On The Exchange" shows the Asset Slips (shares) you currently have on the exchange for sale.
Clicking "get back" brings your Asset Slip back to "My Couch" (marked with the value you tried to sell them).