It isn't an error - perforating stamps could be an inexact business. You'd need a much more extravagant misplacing of the perforations to attract a collector of oddities.
To be more clear, it is considered a poorly centered stamp and thus less valuable than an odinary stamp. So you have a poor example of one of the most common stamps. Your postcard is worth more than the stamp, which is usual for this stamp issue.
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