This is what it looks like for me Changing the measurement to cm in the settings doesn't seem to affect this one way or another. I checked Vanilla PanO and Sval. You may want to test w/ different browser, refreshing, etc. and confirm you're linking to the latest army builder - would also be helpful to know if this is just in a particular Sectorial. If it still doesn't work and you can trace a cause, probably best to report in the Infinity Army Bugs Forum
Just checked, and it does in fact seem to be exclusive to MO. Hard to tell if it's intentional or not but I do suspect it may be a bug. It hasn't yet been reported in the Army Builder bug forum, so it's probably worth identifying there.
I suspect that it’s not a bug. It’s probably a discount in MO. The Sepulcher knight gets similar treatment. It’s possible though, so you could report it to the army bug thread.