Hello,
It looks like you’re using the WooCommerce brand filter instead of the Woodmart brand filter.
To fix this, please try the following steps:
Go to Products > Attributes, find the Brand attribute, and configure it for your products.
Navigate to Appearance > Widgets and add the Woodmart Brand widget to the Layered Nav widget area on the shop page.https://xtemos.com/docs-topic/product-brands/
This should allow the filter to work correctly.
Best Regards,