I believe the issue is quality control. Motorola equipment must meet stringent standards before it is released for sale. Some third-party suppliers of both chargers and cables have less stringent standards. Some of their stuff works fine. Some of it doesn't work.
The approach that has pr
oven to be sound over and over again is to use the charger and cable that came with you phone. This establishes a reference point. Experiment with other chargers and cables if you like. If you run into problems you can zero in on the solution by reverting to the OEM charger and cable to prove everything is OK and then swap in the third-party charger or cable.