Can't add ClockDrift field in builder

[metempleton]

When I try to add a ClockDrift field to the stationXML that I just finished creating with the Network wizard, it vanishes after I paste my value and press return. My value is 2.5E-06. I also tried 0.0000025 with the same result. This value is compatible with the stationXML documentation found here: https://docs.fdsn.org/projects/stationxml/en/latest/reference.html#clockdrift