Hi Zabbix DEV,
Alright, found the first value mapping issue. Let's see.
In Image 1 you can see an item with a template level value mapping, which is working fine.
In Image 2 you can see the item on the host, which I will mass update.
In Image 3 for some reason it is possible to select Host Level value mappings. Already VERY confusing as these can also include duplicate names.
In Image 4 you can see I successfully Updated the value mapping using mass update. It doesn't actually do it though, but Zabbix is giving me confirmation of this anyway.
The issue? Zabbix shouldn't provide me with any host level value mappings upon mass updating a template level item.
Secondly, why is Zabbix letting me do everything, confirm it's updated and actually NOT update the item?