Made two separate reservations within a few second...

Made two separate reservations within a few seconds. one went through and was confirmed and other wasn't for which i got a cancellation email after 10 hours(even though it was within the time frame but still caused me inconvenience of choosing the same flight for $200 extra). No issues with the site or navigation as such. But i will not book with flight network again and won't recommend anyone who wants to make two separate bookings for a same flight.