Replaced a dead drive, FreeNAS "assumed" replacement needed to be a stripe

I'm not sure why it did this, I didn't get around to completing the disk replacement yet, and somehow ended up with this:

The stripe directly under Blackbox needs to go away. There's no data on it at all.
The RAIDz2-0 array is where this drive needs to go, where the 46000894-etc entry is.
I was getting ready to do this process and noticed that the drive was placed under the stripe heading.

I can't figure out how to fix...

Replaced a dead drive, FreeNAS "assumed" replacement needed to be a stripe