I’d change your imported auto increment to a number field. Sort this number field in ascending order then add a new auto increment field (which will take a few minutes to appear due to AWS scheduling).
You should then have them matching and can delete the number field.
Thanks, but the field was already a number. Look at the image to see the strange results. The first auto inc I created yesterday. The 2nd one this morning and the 3rd one just now. Go figure?