Snapping, Maybe?

I recently moved to Adobe CC. I must have inadvertently tapped a shortcut key because something is now happening when I edit in Multitrack and I would like to undo it. Before my inadvertent tap, I could highlight a portion of a file why it was playing, most of the time ahead of the moving cursor, and make a quick deletion of a breath or something before the cursor arrived at the point. Now, when I highlight something ahead of the cursor while it is playing, the cursor jumps to what I have highlighted and does a looping playback of what I have highlighted. Any idea how to restore things to whatever I am editing on the fly continues to play with jumping to what I have highlighted? Thank you!