I have just updated and now when i swipe with the 3 finger gesture to move between workspace, its snaps any open application to the side…
I updated around lunchtime today when it started happening, Any ideas what could cause this
Who knows but I can recommend an extension which overwrites the default ones and gives you better ones up to 4 finger scrolling 
https://extensions.gnome.org/extension/4245/gesture-improvements/