Hi Eriks,
I am really sorry for the delay of this reply. Ah I see what you are trying to achieve here. Unfortunately it is not possible for easyblog 5 to use same menu item that the user are currently on as default homepage when you click the homepage button.
However I've applied some modification on your /administrator/components/com_easyblog/themes/default/settings/seo/advanced.php so that easyblog will always use current active menu item id as default routing behavior and the filtering should be working now. However this might affect other blog url outside easyblog components such as the module. If everything is working correctly, you can keep the file that I mentioned above as backup for each easyblog update later in the future.
Hope these help.