If you want to display multiple skeletons like in a game, then please use a game engine/framework and not Spine Web Player. On mobile, there is a limit regarding the number of WebGL contexts you can have. Each player needs 1 context. It's usually somewhere between 4-8 contexts before the mobile browser gives up. This tells me you have a ton of contexts (and thus web players) running:
Please have a look at spine-phaser, which is likely the easiest web-based runtime to get going with. Don't mix and match canvas, WebGL, Player, Construct, etc. you will simply run into a huge amount of problems. Pick one tech stack and stick with it in your entire application.
