"Sudden Moves" of participants video locations in a ZOOM meeting

[SUDCCIV]

Spoiler

I would like to find out why my participants in my daily Zoom groups have their video feeds "bounced" from the top of the screen to the bottom (or too the middle), AFTER all participants are admitted to the meeting (I run a daily group of 15 clients maximum, and see clients "video shots" move from the top of the screen to the bottom, as if the computer is
"possessed". 

Explaination respectfully requested. 

[Ray_Harwood]

@SUDCCIV  – Zooms order for a lot of things is often hard to figure out!

 Things like gallery view videos and participant lists entries seem to move sound a lot.

The presence of Host, Co-Host, Raised Hands (and other “feedback”) can affect position, as well as Spotlighting and Pinning videos. And if you are hiding people whose cameras are off (“Hide users with no video”), then people turnung on and off their cameras will affect the order. 
Zoom does move things sound quickly at times. There are some ways to help control this:

•  This Zoom Support article on controlling your view has some pointers
• There is a relatively new capability for you to customize and save the gallery view order; see this Zoom Support article.
•  Spotlighting and Punning speakers can help in some situations. See the Zoom Support articles on Spotlighting and Pinning.