Searching the key value and not the label value

[Skip2MiLu]

Hi have an issue where a search in a drop down is not finding the label, but search for the key works. 

What am I missing? Why do I think the concatenated key is causing the issue?

For example this is the label I am searching for

My label field search tick is on. So can not be that. 

Do not find Serenity in search

How I find it if I search for part of the key text.