BUG in Excel Export button
BUG in Excel Export button

If you have more than 16 digits long number in any cell, export cut them to 16 chars and fill the rest with zeroes.
Example: https://jsfiddle.net/z42hrp3b/2/
How to avoid this behavior?
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Answers
How to avoid that?
The problem is Excel has a 15 digit number precision. You can test this by using your CSV export then import that file into Excel. You will see the same result.
Kevin