@NiroVi 

Looking at your screenshot, the third AP (6c-5a) is the ROOT and the first AP (1c-61) is its mesh client, this is indicated by the wifi type symbol after the CONNECTED.

Looking at the second AP (60-a4), it has a status of connected and no wifi symbol.  This indicates it has a LAN connection to the controller and therefore is not connected via MESH.

This appears to be working perfectly.   Its always better to have the APs connected via LAN, its much faster than MESH.

Mesh simply means that an AP is connected to another AP via wireless and NOT via a cable connection.   Is it perhaps Roaming you are worried about?  These are different things.   What are you trying to achieve?