In reality, the cloud base is determined by a number of factors such as temperature, humidity, dewpoint. Clouds on the ground is not unusual at all, we commonly refer to it as fog! It forms by the same process as clouds.
If the local weather stations report to the sim that there should be a cumulus cloud layer at 800ft with 1 okta of coverage, and you are around terrain of 800ft+, then the sim is going to draw clouds that are clipping the ground like in your screenshot. I don’t think it’s a problem, just a limitation of the system