Why you just don't believe that it is your policing working? It is doing what it is supposed to do - drop traffic above CIR. You may want to chenge your policing config if you want to allow more traffic to pass through.
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Nik has likely touched upon the most likely issue, i.e. low average utilization can have have short traffic bursts.
Look at your original post's policy.GIF. The second interfaces shows low average offered rate, but the policer is dropping some packets.
More likely than there being something wrong with you serial link, your policing policy might be suboptimal.
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