Here there are two child tables (earnings and deductions of same doctype Salary Detail). Earnings and deductions are name of the sections.
After exporting data, only last section is there in the csv and that too 2 times. All entry of deductions sections are present in earning section in the csv.
Even after correction of csv and importing the data, data is only imported to last section (earnings).
Two child tables of same doctype. What happens on my end, is that the data imported for the 2nd child table shows in the first child table. Currently using the v15 as well.
for temporary solution you can change the section name label to differentiate this section. and you can try again its work. we also fetch same issue and do this for temporary solution.