No value may be entered in the antenna height, as the antenna height is already shown in the Rinex file and thus already calculated. You have to enter a 0 here, then the height will be calculated correctly. I also have a request for this to be made by Emlid.
Emlid Studio Beta - #166 by dieter.buchholz
But you have to swich “use Antenna heights” to on, because otherwise the rinex-header Antenna-height will not be calculated.