I think that Gdzie can be used both with static and motion verbs
I think not. In proper Polish only 'dokąd' is used for motion. It indicates the target, while 'gdzie' indicates the place of the action. Eg.:
Dokąd idziesz? Do domu. Where are you going to? I'm going home.
Gdzie idziesz? Na ulicy. Where are you going (walking)? In a street.
Unfortunately, most Poles would understand 'gdzie idziesz' as 'where are you going to'
although the usage is incorrect and rather uneducated