i see that you have 3K null records....
Going back to your issues, the best way to solve is to contact support or open a case. Be ready to drop a workbook with dummy data (if possible).
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I've narrowed down the cause with a 19-row Excel sheet: the date/time field is actually a text field. After the first import, I change it to a date/time field and life is good. Then, if I re-import the data, the field is configured to receive date/time info, but sees text info and then enters "null" into the imported field. At least that is what appears to happen.
So, now I'll take this support.