Liverpool's just don't have enough quality on the pitch to either convert pressing turnovers into chances or to hold the ball effectively when in possession (and not turn it over in bad places when Spurs presses). Part of that is probably players getting used to a new system but you can't play a workmanlike quartet like Can, Lucas, Milner, and Lallana all at the same time in midfield and expect to do much on the ball. Ideally, you have maybe two of those guys in a lineup at the same time to provide some steel (Can or Lucas at DM) and some energy (Lallana or Milner somewhere). But all four is just bad news, especially when you're also playing with a young backup striker that isn't very good at holding up the ball and bringing others into play.
I think they'll play a lot differently when Firmino, Sturridge, and Benteke are all available. But Klopp may also need to find a central midfielder with more quality. Lucas and Can together is ugly.