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Hi @Jean-Charles , What version of Alteryx Designer are you using? I just tried your workflow with 2020.2, and even though it showed the wrong result first, as soon as I removed the field Close in the Interactive Chart, and added it again, it worked fine.
If running the same version as mine, I don't see any reason why you'd have a different result.
If running an older version of Designer, can you try to add a data cleanse tool (prior to the interactive chart). The fact null values are within the data may be a reason why it's not giving you the right result. Once data cleanse added, try to remove the field on the interactive chart and add it again.