What's up with the legs

It's been 11 days since we did the last ride from the Mexico Trip. Spent a week just doing hardly anything. Got back into it the other day.
Tues-45min ride, easy with one climb
Wed-1hr ride with a really steep hill climb.
Legs felt soo weird. They would not turn over on the steep climb. No snap. But on the flats I was pushing speeds I rarely do.

Thursday - MSP intervals. 4x8on 4 off. Did them at 270w. This is what I did some 4 min intervals at a few weeks ago. So by the numbers there is something going on. But my legs hurt walking up stairs now. I think I'm still recovering.

But now I'm in the MSP phase. This causes the dead leg syndrome. It takes a few weeks of regular riding to get the snap back.