Without output, it's kind of hard to tell but:
1. Change the refresh rate on your LG monitor from 144 Hz to 120 Hz and cap your games at 120 FPS.
2. Generally advised to run OBS as admin. Right-click on shortcut, properties, advanced, check box, ok, apply, ok.
3. Your log contains no recording or streaming session. Results of this log analysis are limited. Please post a link to a clean log file.
To make a clean log file, please follow these steps:
1) Restart OBS as admin.
2) Start your stream/recording for about 30 seconds. Make sure you replicate any issues as best you can, which means having any games/apps open and captured, etc.
3) Stop your stream/recording.
4) Select Help > Log Files > Upload Current Log File. Send that link via this troubleshooting tool or whichever support chat you are using.