Please read and follow directions and recommendations on the analyzer:
OBS (Open Broadcaster Software) is free and open source software for video recording and live streaming. Stream to Twitch, YouTube and many other providers or record your own videos with high quality H264 / AAC encoding.
obsproject.com
Once you're done, please use this tool to check your internet connection against Twitch servers:
https://r1ch.net/projects/twitchtest
Anything below 90 quality is bad and most probably an issue on your ISP. The closest servers to you should always be 100% quality.
According to the log file your local network looks good (1 gbps) so I don't think the issue is on your side, unless you're using some program that "helps" getting a better connection, which is not the case for streaming. If you use one of this apps, undo the changes it did, then uninstall it, restart the computer and test again.
On the OBS side, display capture must be on it own separated scene, never set it with game or window capture because it causes interferences.
Also, you only need one game capture per scene. If you want to add a different type of game capture it's advised to do it on a separated scene as it tries to capture always, consuming more resources.