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Is it normal for the wall wart power supplies to be off of their rated voltage? I have one that is rated at 9vdc and it puts out 13.8ish and a 12vdc that puts out 19v.
Recently there has been a trend to ship regulated off line switching wall warts with various devices. These kind are regulated so they put out pretty close to the stamped voltage. These kind are not quite as reliable however.
That is normal on most power supplies and is not the cause of the problem.The problem is that the cap charges up to the peak voltage value if there is no load applied and so many wall warts put out around 1.4 times their stamped voltage value until a load is connected.