Today based on a post from the community I observed a strange behaviour on the concatenation of an Hierarchy based on Number/text values.
I'm on the July version of PBI (Version: 2.60.5169.3201 64-bit (July 2018))
When putting the hierarchy levels on X-axis if you do the full drilldown on your chart and turn off the concatenation the X-axis still shows as concatenated:
If you go to the ... and select a sort by, then the X-axis assumes the concatenation OFF.
See attach a PBIX file with 4 charts (text and number hierarchy) top ones are concatened off and made the sort by bottom ones didn't make the sort so you can test it on your computer and check the changes.