Can't get object to move behind another object... help?

I've tried using front and behind in Indesign 2017 and this usually works, but lately this has been an issue. I can't get objects to move either behind or in front of other objects. I even try select the first object, etc. That never works. I try saving, reopening, restarting computer. Nothing. I can't get the object I need to move to the front and the other object to go to the back. The objects are not locked. I'm at a loss for what to do and why this seems to be happening more????