Misaligned rows in Fixed columns when scrolling Y

I used datatables fixed columns but on load my rows are not aligned. At first it was a tiny bit misaligned but as I scroll, the row misalignment becomes more and more misaligned.

On load this is what it looks like (note: the first two columns are the fixed columns)
1st photo
then if I scroll vertically at the bottom notice that the rows are not aligned at all
2nd photo