Hello Lukasz,
As i can see the main issue is that you renamed agama-pro theme folder to agama-pro-3, also i can see you have Agama Pro v1.3.3 and v1.3.4 both on your Themes page, please remove all old versions of Agama Pro and use newest one and rename agama-pro-3 folder back to agama-pro (you will need to reactivate theme again from themes panel).
Also do not play with things like that if you are not experienced enough with WordPress itself 😉
Best Regards