Iphone screenshots sync into ipad?

Ok so I screenshot this thing and when my cousin used the ipad she said what is that? Plus my contacts synced into it too. And so can I undo that, is there something in my settings to switch to off, or something?

Just go into your photos and delete it there
That's how I do it

This is all linked by iCloud. You can disable this by going into your iCloud settings on all the devices that you want this done to, and flicking the switches that you don't want synced off.