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Is this a recalled flight plan or a fresh one you just created? If it is a saved mission, the current version of the app doesn't display the proper height on the altitude slider but the flight plan is actually correct and will operate at the originally planned altitude. This has been fixed in the next version.
If it is a fresh flight it could be that you have a 120m limit on your flight but I am pretty sure it will give you an error on takeoff if that is the case.