Animator tab makes my game play more smoothier, why?

Hello everyone,

When I run my game inside Unity, my player keeps walking alone after i press the movement button, without me asking him to do it. But when I have the Animator tab opened on the player object, it acts as it should, just walk and act as i ask. When I export it to an APK and run on android, it is also normal.

Is there a fix to it, please? It is quite annoying.

Thank you!