Yes, this can happen if the pots are not used according to instructions. The Magnaware pots are not suitable for boiling water directly and/or cooking pasta, or noodles. They’re best used for soups, stews, chillis etc.
If your pot has turned black after boiling water, the best solution is to fill it up with baking soda and water mix, bring it to a boil, and let it simmer gently. Then use a brillo pad and a cleaning product suitable for aluminum (such as Bar Keepers Friend or Bon Ami) to clean the remaining stains.