If you're using a remote control with a QWERTY keyboard on it, try pressing a button on the simple infrared remote control instead.
Have you had a dig through the options shown when you click on the Settings icon (one or two cogs) in the homescreen? If nothing useful, have a look on the second row, far right More Settings, click into that area to check other settings.
I'm assuming this is in Android, rather than LibreELEC?
Does it ONLY do this when Kodi is open, or does it do the same if you just have the launcher onscreen?
Does your DroidBOX connect directly to your TV via an HDMI cable, or is there an AV amp/HDMI switch in between?