Describe the bug
Tried to create a weakaura on Retail which was:
Dynamic group: attached to Nameplate
Trigger: Aura/nameplate/(de)buff/single spell id-bolstering/auto-clone/combine matches per unit
Display text: %matchCountPerUnit
No display text is shown (not working) and one icon. (correct)
I'd think %matchCountPerUnit would at least output something with an active trigger.

Changes from default above:
Removing combine matches per unit - Shows multiple icons but the text shows correctly. (correct)

Changing the display text: %matchCount - Shows to combined count from all nameplates (correct)

Removing auto-clone - Shows one icon (correct) but the text shows the value that would be %matchCount (incorrect). Text should be %matchCountPerUnit.

There seems to be a conflicting issue somewhere when using a combination of dynamic group attached to nameplate + text: %matchCountPerUnit + Combine matches per unit

To Reproduce
Testing weakaura:
Trigger: Aura/nameplate/debuff/multiple spell id's for testing purpose/auto-clone/combine matches per unit
This seems to have the exact same functionality as the other from a testing stand point.

This is what I was using as a blood dk for testing on target dummy's:
https://wago.io/vougY4gjO

Which version of WeakAuras are you using?
Latest Retail, 2.15.2