"Planes Don't Do That So Why Does It Go Up Like That"
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Who's gonna tell him?
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Flaps create a downwards force of air in the wings which causes the nose to pitch upwards, they are typically used during takeoff and landings and used to be used extensively in combat (back when props were dominant)
When landing, the flaps will cause the aircraft to pitch up, which leads to "flaring" which is how aircraft are supposed to land (back wheels touch down first, nose wheel touches down soon after), and they especially cause a lot of pitching when gliding because your plane is now unpowered and running entirely off of lift, and those flaps are creating more at the cost of increased drag (and slowing down the plen)

flaps raise the AoA (angle of attack) upwards for lower speeds.

@XjAircraftManufacturing did true?

Lift