Most printer these days have settings you can configure to your liking. It's not uncommon for folks to turn a feature on or off without knowing it.
First, get the instructions, you can probably down load them on line, and see if there is a way to reset to factory.
If there isn't, unplug it and leave it unplugged for an hour or so (some folks say a few minutes, but I error on the side of caution). This should allow all of the power to bleed off and all of the settings to default to factory.
But I'm betting if you get those instructions it will tell you how to deal with this.