CMC is not accurate. They just collect data, put an algorithm, then show the data.
I noticed a lot of differences in prices of many coins on CMC. They just use api and that have flaws, but they don't care.
Yes, it is not much accurate so I don't rely on it too much, I also check other like Coingecko for comparison analysis.
And let's not just rely on them too, checking in CMC is just one way factor,but having it in top 100 doesn't guarantee that they are worth investing, there are other tokens out there that are worth investing but not yet updated in Circulating Supply.