So basically I don't know what to do anymore, so I came here to ask you guys if you know whats the problem...
So I'll try to explain.
As you can see In the photo, in effect timeline I did some changes with brightness, when I start the video in this timeline it shows me that effect is working and everything is okay, but when I watch the video I can't see any of changes
Watch the video where?
Also, is this the same problem that you posted about wanting to use Skype? If so, I'll delete that other topic.
There are often issues when applying other effects in top of Time Remapping. The general advice is to not do that. Nest the Remapped clip into a new sequence and apply other effects to that nest.