I suspect this is a bug...
Any hints why the VAM (vertical speed/climing rate) shows up as mile/h when the rest of the settings are in km/m (metric)?

I suspect this is a bug...
Any hints why the VAM (vertical speed/climing rate) shows up as mile/h when the rest of the settings are in km/m (metric)?

I don't think this is a metric/imperial issue. VAM is never measured in mile/h. It's either metres per hour or feet per hour
Is this in the post ride summary or on the real time training pages?
It reports OK on my unit using build 3.33

I've just checked my device and can recreate it by setting my language to Swedish (version 3.2)
I have passed this information on to Garmin.
You could hack the Swedish text file, if you felt like it. In the Text folder look for the Swedish.gtt file
Then look for the following and change it.
<str>
<tag>TXT_SUMMARY_HISTORY_meter_per_hour_STR_M</tag>
<txt>mile/h</txt>
</str>