Are you using the 8bit or 32bit board so I can send you a parameter file to help you get started.
It sounds like you dont have the correct settings running on your controller which is causing it to act strange. My first suggestion would be to power the board and connect the USB and on the main screen on the config first make sure that you calibrate the accelerometers. Once that is done on the Basic tab also click on the auto of the motor configuration.
Then you should set all the PID values to zero and start working your way up to get the desired parameters. The video below shows you how to do this
Also you can read the topic below for more information on setting up the alexmos board