Main Camera is resetting its position in unity - unity3d

I'm new to 3D game development and I'm trying to make a 3D game in Unity v2019.4.39f1.
I'm facing a problem with the main camera's position.
I made the main camera to be a child of a game object so that it follows it. This is the hierarchy of the main camera.
Main Camera Heirarchy
I initially set the position of the camera as shown in the figure.
Transform before starting the game
But during the gameplay, the main camera's position is always reset to the one shown in the following figure.
Transform after starting the game
Can someone please help me fix this?

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Here is a video I recorded.
https://youtu.be/2hb9m01PQBk
Are your sprites on a prefab, or children of another game object? The Transform of the parent object affects the transform of all children.
It looks like this is a camera problem. Your camera is set to perspective, it is possible to do parallax backgrounds with a perspective camera and you may have already accomodated for it, but that is the first thing I would check.
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