Mission bug radix module / deorbitting does not work

dear Druu team,

for days now, I've tryed to solve the spe station mission. I brought the station into space, solved apoapsis, periapsis, inclination & tryed many ways to deorbit, as Im told. All rocket related components & later on the radix itself i got below 78km, yet the mission counter still does not grant me success. This is what is letting me to belive there might be a bug.

I would be happy if you cicould have a look. thanks & cheers