TS DTV Stream may contain Video, multiple Audio Streams, Teletext Streams, etc. It is as it says 'MPEG Streamclip', strips Streams from Transport Stream files and the like. This is an App that I really could not do without.
'Info' on the App and check 'Open in low resolution' definitely fixes it, but note that any major OS Updates resets it and you have to set it again. I first noticed it on my 2015 27' 5k Mac (I believe it was El Cap then). Further to my comment Dec 22, 2017, the GUI misplacement is a Retina High Res thing, rather than related to MacOS version.
