Denise - did you use a flat finish? If you did this is likely the problem. All flat paint show marks like that - it is just on dark colours you see them.
I would recommend using either the RL Eggshell or Satin - it should solve your problem.
If you would like to talk to someone about it - get the phone number of the Glidden Rep from The Home Depot - he or she will come and take a look for you.......
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