The height of your launch point shouldn't make much difference.
There are two possibilities.
1. You have a max altitude limit set or
2. You bumped into a no-fly-zone related to an airport
Your recorded flight data would probably help find out which.
My default was set to 120 meters, which translates to 392 feet - to actually set it closer to the 400 ft. legal max (US), I set it to 121 meters, which translates to 395... though still legal, it is shown in red font.