Video Issue

I'm assuming this is a video issue. After doing a fresh install on a newly purchased HP Compaq Elite 8300 with an Intel internal graphic card, running Plasma5. I always have two users, mine & the wife, and we use the Switch User feature. I do not have this issue with Plasma5.
I also installed PekWM and use it to log in, but now I've noticed if I'm running Plasma and log out and re-login with PekWM, the screen is not displayed as should be. Here is a screenshot of how it looks:
https://imgur.com/a/E6IJtrG
Any idea what could be the cause and how to fix it?
I also installed PekWM and use it to log in, but now I've noticed if I'm running Plasma and log out and re-login with PekWM, the screen is not displayed as should be. Here is a screenshot of how it looks:
https://imgur.com/a/E6IJtrG
Any idea what could be the cause and how to fix it?