Check all your outlets that are connected to that circuit. Open the outlet and make sure the wiring is correct and there are no shorts, loose wires or crossed wires.
If those are ok start tracing the wiring back. You could have a bad junction somewhere or a screw could be shorting through the wires. It has happened before and you could research it here.
Get a little tester and check the polarity of all your outlets while you are at it. Like this one on Amazon.
Power Gear 3 Wire Receptacle Tester, Outlet Tester, 6 Visual Indications, Light Indicator, UL Listed, Yellow, 50542
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