You are running Windows 11 Insider build 26200. Some checks that are applicable only to specific Windows versions will not be performed. Also, because Insider builds are test versions, you may have problems that would not happen with release versions of Windows 11.
Dynamic Bitrate is enabled. Instead of dropping frames when network issues are detected, OBS will automatically reduce the stream quality to compensate. The bitrate will adjust back to normal once the connection becomes stable. In some (very specific) situations, Dynamic Bitrate can get stuck at a low bitrate. If this happens frequently, it is recommended to turn off Dynamic Bitrate in Settings -> Advanced -> Network.