Level Sequence rendered movie and images low qualit and overexposed?

Hello all, For the first time I am trying out the Level Sequence feature in order to make a showcase of the environment I made for my graduation project due in two weeks. However, I’ve stumbled upon some issues. Most notably, whenever I render a shot for testing purposes, it comes out a whole lot uglier than what I’ve got on my screen: the texture quality is low and the lighting seems to brighten up with every passing frame. Imgur album with screenshots!
The lighting has been built at production level quality so I am very unsure what causes this. When rendering, I have “Use Separate Process” checked on, as checked off leads to an even worse quality. Compressions turned on or off makes no difference, seemingly. Anybody out there who knows what might cause this? Thanks in advance!

In which menu is that show tab?