It is potentially the change to a 3dB margin that may have given you the increase.
What I can see though is that your line is not as fast as it could potentially be.
a 7dB attenuation would point to a DS attainable of 90+ Mbps especially with a 3dB margin and possibly over 100Mbps.
Your upstream attenuation is not shown however going by the DS attenuation as a guide, then I would have expected your upstream attainable to be way over 30 and not as low as 23.6
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