It isn’t working fine when selecting from the dropdown menu, as shown in the video – https://share.getcloudapp.com/OAu8zqqW
Picking any sub-category from the dropdown menu ticks that sub-category but still shows all items from the parent category.
IE. I selected Disney from the dropdown menu, the Disney box alone was selected on the new page but every item was shown until I selected Frozen and then un-selected Frozen. The page then just showed Disney.