Well, your time is multiple minutes above the average in some cases.
Not that that's bad, I don't like timed tactics either.
But I suppose the ratings of the tactics are figured in with the average time it takes to solve them. So you "beat" them, but lost on time because other 1600s solved them faster.
Again I don't like that kind of TT, but that's how this site does it.
I don't know what it is with this Tactics Trainer thing anymore. I've tried racing the clock, spotting patterns, playing the most obvious move, and now this: