last german mission too easy please help

[samedi]

the first time i played the last german mission on medium i remember it being impossibely hard, i was pushed back in 15 minutes and that was on medium. but whenever i load the mission to play again its toooooo easy compared to last time, hard is easier than medium in my game, is this an error or what because the first time was very hard and the second time it was so easy it was booooring