Scrimmage kick mess!

[Illini_Ref]

K punts. The punt hits the ground and R plays it on a hop. R muffs the ball (new force on a grounded kick). Ball is rolling towards R's goal line. K then muffs the ball at the 2 and it rolls into the endzone where it is recovered by K.

Touchdown or safety? This may be really easy and I am just not seeing it correctly. I know that R created a new force by muffing a grounded scrimmage kick. My problem lies with the muff by K. Is that a new force and if it is, would it be a touchback since the kick has not ended?