Why is my video brighter and sideways after exporting?

You appear to have HLG media, on a Rec.709 sequence. If you don't have consistent and appropriate color management settings in Premiere, that will happen.

As to the rotation, that's bizarre. 

Either way, we would need screen grabs of your color management and export dialog panels. Make the screengrabs, drag/drop them directily into the text reply area of your reply, so the images simply appear here with the text.

Have you reviewed in another video playback program? Are there other users who use your machine? Your file might be fine and it is VLC applying filters on playback.

Please share a screenshot of your export settings, not really possible to diagnose without that.

Please post comp specs, Premiere version and build.
Also screenshots of MediaInfo info in Treeview on footage used, sequence settings and export settings.

https://mediaarea.net/en/MediaInfo

looks wierd! but are you sure you're using the right settings ? try render it in H264 and use Match source - High Bit rate for example and make sure you're not using any video effects in render settings
i guess this can fix it if everything else is okay.