They are positions currently in the market, not tps. The bars were made much smaller over the years, probably because they are not a top priority. Now a days they change colour depending on if they are above price or below (what you saw with the flickering is what I mean). It may not work perfectly but who cares, its never a problem.
When they are significant and “real” enough to be of importance, you will know; I know that’s vague, I apologize for that, its a part of MK that just takes time and experience. 🙂