I was running some tests on my Mavic Pro and initiated RTH. I had the RTH altitude set to 98ft but in one case I was flying at 15ft and the drone only ascended to 33ft before returning. Concerned I tried it again. This time I was at 36ft and the drone stayed at that altitude while returning. My Airdata logs confirmed that RTH was set to 98ft. In both instances the drone was only about 30ft away frome the home point. Was the close proximity to the home point the reason that the drone didn't rise to the set altitude?