I'm guessing that you focus your shots using the shutter button. That being the case I want you to consider a method that lets you focus independent of the shutter button. By so doing you can then re-frame your shot confident that your focus point hasn't changed.
Check your manual to see if your camera has a few programmable buttons. If so I recommend my favorite method, back button focusing. I've programmed the button indicated in the image to be my focus button. I still use the shutter button to start metering but once I've focused on a point that point remains unchanged as I make other adjustments.