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In Brackeys's 2D Movement video, he demonstrates how to use the premade character controller script to make the character object jump. After following his instructions, my character jumps much higher than his, shooting off screen above the camera. The jump force is the same, and the only major difference I can think of is that I created the level and tiles myself, and that I am using the 2019 version of Unity.
Does anyone know what might be the problem?