Thanks for the tip, Lynn. I keep running out of stuff like the pea gravel but have a new bag of that so I can fix that one pot that has too little. The other I think you're seeing is actually tilted so the gravel just doesn't stay at that top rim. And the little bonsai pots of rollers are tipped up against the larger container edges so they will drain more easily during this rainy time.
I'll go around and refresh gravel today, as part of my one dry day tasks! (more rain on the forecast but, not today! Whew!)