Mesh moving erratic

Hi there,

I’ve been making a landscape and everything was going fine until about 45 minutes ago. For some reason all meshes are chosing to move in an erratic way when I scale, rotate, or simply try to move them, this makes lining everything impossible.
I have a link to a video of my problem, if for some reason the audio for it is not working on my end, even though I tried to be rid of it prior to upload, PLEASE PLEASE PLEASE either mute the video or drop it to very very low. - Reason for those curious by this, I am listening to music, and I don’t want to hurt your ears.- YouTube had little success trying to find an answer for this, as i’m just not sure how to ask google about it. Any help would be greatly appreciated!