Can somebody help me?

Hello I’m new to the forums and Blender
When I was doing my first model it was everything ok till this happened

https://youtu.be/2tTk-s-a8f8

I don’t know what i touched and don’t know how to fix it

Also, sorry for any grammar mistake, spanish speaker here

You’ve enabled proportional editing:

http://wiki.blender.org/index.php/Doc:2.6/Manual/3D_interaction/Transform_Control/Proportional_Edit

Thanks, that help me

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