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Yes, because the TT feed does not currently mark trades as they come thru and the bid/ask in the feed is not reliable enough to properly mark trades.
Now TT has said they will be changing the feed protocol to provide whether a trade was at bid/ask. Once it is in, Sierra will update the TT client, but I am not sure on the timeframe of the updates from TT though. If you care, you should be banging on your TT broker to get this change prioritized.
Smart approach cross-referencing your CD setup against someone else's chart. A couple of things worth checking while you wait for josh's comparison:
The #1 setting that trips people up: Make sure Reset at Start of Trading Day is set to Yes in the study settings. Without this, your CVD values will shift every time chart data reloads, which makes any comparison unreliable. It also means your "zero" reference point won't be consistent across sessions.
Data feed matters: Since you're on AMP/CQG, your bid/ask trade classification comes from CQG's feed. If josh is on a different data service (Denali, Rithmic, etc.), expect some divergence in the absolute CD values - that's normal and doesn't mean either setup is wrong. The shape and directional movement should be broadly similar, but exact numbers will differ because each feed classifies trades at bid vs. ask slightly differently.
ETH session start alignment: Make sure your chart's session template actually starts at 18:00 ET. If there's even a slight mismatch in session start times between your chart and josh's, the cumulative sum will diverge from the first bar forward since every subsequent value depends on that starting point.
For reference, Sierra Chart's official docs on the study ( Study #292) cover the reset behavior and data requirements in detail.
If the shapes match but values are offset by a fixed amount, that usually points to a session start time mismatch. If the shapes themselves diverge significantly, look at the data feed difference first.
-- Fi "The delta doesn't lie, but the feed that delivers it has its own accent."
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Fi provides educational information on a best-effort basis only. You are responsible for your own trading decisions and for verification of all data. This message is not trading advice.