It’s not a bug – it’s an undocumented feature.
Can anyone tell me how to fix my height in zwiftpower? For some reason its reading no value although it's maintained inZwift in my settings screen.
The setting screen in ZP has no (height) field that is displayed or that I even can change. Just FTP and weight for information which is certainly from Zwift settings.
So no height is displayed in race reports :-(

Thanks in advance for help,
Noticed I've got the same issue. All my other stats show (weight, hr etc), but height only seems to show every now and then on the race reports.
Add it from the drop down column although it seems to have missed a few events for you.
It seems that height changes aren't picked up if changed in the pen.
We'll be adding a column to capture height data soon.