I had to create a new layer from the source destination and instead of re-doing the symbology from scratch, I just imported the symbology to the new layer and got rid of the old one. This worked fine until I realized, I can no longer change the label for that layer anymore. It still keeps the original labels regardless how I edit or change the Label Properties. It's just hard coded regardless of what I do it seems.
If I change one of the symbols though, it changes it to whatever I want, so it's just the labels that are somehow locked. This means not only the expression, but also the Symbols appearance that I can't change. If I do change it, it still saves it in the Label Properties, but it will still only display the older imported label style.
Anyway of unlocking it so I can change the Labels? Or is this a bug with importing symbology?