It seems like this menu alias conflict with Easyblog single category page (
http://take.ms/3mCpN).
If you do not want to change this menu alias, i would suggest you that create hidden menu item for each of your existing Easyblog categories from your site backend.
For example : Create Easyblog - single category menu item for this category
Stories under your hidden menu
So the system can identify this category will link to this single category menu item.
You can check my screenshot here :
http://take.ms/3LEHH
And you have to create menu item for the rest of your Easyblog existing categories as well.