Ohdrasil

I'm kinda new to this game but thought this mod would be a fun way to get more into it. I have however found a problem, whenever I try to get past the first mission (fly up to 70,000 min altitude with some equipment) everything is going well and I reach my goals and everything is green in part 1 of the mission but i cant finish it. When I then fall back down and land safely part 2 of the mission is green but now my altitude is red. I dont understand what im doing wrong. If someone knows what im doing wrong I could really use your help