The Outfitter pane becomes transparent when shown over the DejaClassicStats pane.
https://addons.wago.io/addons/deja-classic-stats/versions?stability=stable

It only happens the second time and after that you open the character pane.

https://imgbox.com/oXIhcPea
The above is the first time I opened the character pane.

https://imgbox.com/LsLTefr2
This is the second time I opened the character pane.