When you go from Inventory > Emotes or Favorites Emotes, there will be a button called “Get More” at the top right corner. Clicking on it will redirect you to the default avatar shop sort, Recommended, instead of the the emotes category.
At the moment the button leads to https://www.roblox.com/catalog/?Category=15, when it should redirect to https://www.roblox.com/catalog?Category=12&Subcategory=39 instead.
I only noticed the bug today but I bet that it has existed for a long time.
For any of you wondering, the link should indeed lead you to a specific category like with every other avatar item such as clothing or accessories.