Moving object with custom vertex shader sends mesh too far

Unity Engine
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1

I am new to working with shaders and I am having issues with my vertex shader. When I transform the object in any way (position, rotation, scale) the effects are exaggerated and I do not know why this is the case. The goal of the shader is to create the illusion of a tilting platform to roll a ball. The following is my vertex shader:

void vert(inout appdata_full v, out Input o){

    float3 worldPos = mul(unity_ObjectToWorld, float4(v.vertex.xyz, 1)).xyz - _RotatePosition.xyz;

    float3x3 xRot = 
    {
        1.0, 0.0, 0.0,
        0.0, cos(_Rotation.x), -sin(_Rotation.x),
        0.0, sin(_Rotation.x), cos(_Rotation.x)
    };

    float3x3 yRot = 
    {
        cos(_Rotation.y), 0.0, sin(_Rotation.y),
        0.0, 1.0, 0.0,
        -sin(_Rotation.y), 0.0, cos(_Rotation.y)
    };

    float3x3 zRot = 
    {
        cos(_Rotation.z), -sin(_Rotation.z), 0.0,
        sin(_Rotation.z), cos(_Rotation.z), 0.0,
        0.0, 0.0, 1.0
    };

    v.vertex.xyz = mul(zRot, mul(yRot, mul(xRot, worldPos.xyz))) + _RotatePosition.xyz;

    UNITY_INITIALIZE_OUTPUT(Input, o);
}

I would really appreciate any help explaining the issue.