Why users can't see records created by other users?

Why users can't see records created by other users?

I have just two roles in my CRM.

Sales people is under the role "Gestor", and they have the "estandar" profile.

But Sales people can't see the leads and contacts created by others Sales people.

Is this normal? how I can allow all the people in the same profile to see the registers created by other users with the same profile?