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DOCSIS 3.1 modems utilize a channel known as the OFDM channel. The easiest way to identify this channel is that the modulation type will be displayed as “other”. It’s normal for the OFDM channel to have correctables and uncorrectables, it is not a cause for concern.
Can you post a screenshot of your levels, please? Also, pls check your PMs.
I conversed with a Comcast engineer who reports that your weird SNR value is an anomaly. "If it’s in the OFDM carrier, it’s a reporting issue, not an actual issue." He analyzed your modem signals and its communication with the CMTS:
The conclusion is that your modem is reporting weird stuff, but it all looks fine on the back end, which is what really matters.
I know all of that about DOCSIS, it's not my first rodeo. I don't see how it not being listed "backs anything up". Whatever. As long as you're happy that's all that matters !!