It seems the shop menu only will display 3 categories like its hardcoded. This is the response from j2store support
Thanks for the reply.
If we change any categories in the "shop" menu, it only displays 3 (single dosers, accessories, and Portafilters), so we need to know if you made any custom code changes for this menu (menu item id:548).
We created a new product list view menu, which worked properly and displayed the four categories.
Here is the video screencast for your reference: https://nimb.ws/IHXBpm
Please look into this and let us know if the issue is not caused by another plugin you were using.
Kindly check and let us know.