Tools are changed automatically. Please help me....

When I quickly change the brush(B) and eraser(E) consecutively to make many brush touches quickly, Even if I don't change it, the brush and eraser change automatically.
Also, this is not just a problem between the brush and the eraser buttons, but also between the brush and the zoom button, the eraser and the zoom button.
I'm sure there's something wrong with my photoshop setting...
Please help me....
My Photoshop version is 21.2.1.
Window version is Win 10 64 bit.

The arrow in the video is just to give an example of what I'm going through with the video to make it easier to explain.
Painting the brush to the right or using the eraser in the left direction has nothing to do with the cause of what I say.
This happens no matter which direction the tool is used....