Please see attachment.
The issue here is probably that the import definition made when you created the action is different from how the file is now: do you have an additional header line ? is the columns header still on the same row as when you created the action?
You can locate the data source in the "Import Data Source" tab of the Action menu and edit it there, or "simply" recreate the action from the current file.
I think it is because of the time mapping issues in the import action. Can you please edit the Time mapping in the Import action from "Dates" to "Match Names". You should be good.
Let us know if that doesn't work.
It would be great if you accept it as a solution so that this case can be closed (provided it solved your problem) so that other community members don't reply to your query