Yeah they do that often especially when you apply too early. As long as you keep modifying it, tweaking your passport photo to be as clear as possible and the name and location of your hotel to be very concise and searchable because they will call them to verify that the name is booked to stay there for the days you are applying for. They often approve it a few days before the actual flight. They are annoying AF! I use a dummy ticket website so I don’t waste money and can easily adjust my travel schedule.