Hi Helen. This is due to a bug in WikiTree software.
At one point, there were two profiles, Brandner-119 and Brandner-347. I think that both were in the category. They have since been merged as Brandner-119.
This should have meant that Brandner-347 disappeared from the category, and only Brandner-119 remained. However, the bug prevented this from happening.
The bug has since been corrected. However, a script to correct the effects of the bug while it was active has not been run. That should happen eventually, and then the left over Brandner-347 will no longer appear in the category.
For more information about this, see "bug 1" as described at
https://www.wikitree.com/g2g/1701433/serious-category-content-variant-surname-duplicate-detection