can't really discern anything other than carbs not quite seated.
In future, a dab of grease, silicone paste or even vasoline on fingers, wiping the inside circumference of the intake rubber to ease install. You will feel a sort of "click" when they properly seat.
Aggressively forcing the carb throat into dry rubber *could* actually tear the manifold. You may opt to temporarily pull them out and get some lube in there.
It'll go easier on both you and the manifold.
Also assure the throttle snaps back on its own before starting (and especially riding).
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