Issue with multiple bill prints for the two wifi printers at the same time

[ashok1607]

We are trying to print multiple bills on the two Wi-Fi printers simultaneously, but we are getting the prints from the second printer instead of the first printer a few times.
Example: KOT1 and KOT2 should be printed in the first printer.
KOT3 and KOT4 should be printed on a second printer.
But sometimes KOT1 prints on printer one, and the remaining KOT2, KOT3, and KOT4 prints on the second printer.
Please let me know how we can solve the issue.