OK, picture this, you are inserting F2L pairs wrong left and right... LITERALLY. Here is my advanced solution to this common problem.
First you do *I M D U M B then stop the timer, delete your previous solve, re-scramble your cube and BOOM!. your solve just got saved... QeyX style.
*I is an extremely advanced move, you have to hold the cube OH grip, flick the R layer REALLY hard so it does R4 and M2. (See Layer By Layer podcast episode 32 "Hyperdimensional Supercube")