In order to help with Bed leveling, knowing what Firmware you are using helps.

I am assuming Marlin in this case. When you Auto home then Bed level in your slicer you can tell the 3D Printer to enable bed leveling data.

You start the 3D Printer do a auto home then a Auto Bed Level.
Then you must save the Bed Leveling Data in one of two ways using M500 or the LCD menu item Store Data.
Now your Bed leveling data is stored in order to use this data you must tell your Slicer startup G-Code to Enable the Bed leveling data.

to do this you will Place a " M420 S1 ; Bed Leveling on " in your slicer startup G-Code after the Last G29 /G29 connand

I placed mine On as the next to last line.