You may need to setup the center of your print bed. The best solution is to upgrade to Marlin Firmware and then center your printer bed in the Firmware configuration files. But, upgrading the newer Anet A8 1.5 boards can be difficult.
I don’t know of any center/offset settings in the Anet Firmware but you can definitely add center/offset commands in your slicing software (Cura). In Cura the settings are in the same area you set your printer type. Just print a centering target (lots of these on Thingiverse) and measure how far off the center of the bed your currently printing.