I can't describe this in any better way. I've attached a small image showing how one line (the top one) has been copied and pasted onto the chart, and then moved into position. No other change has been made. Look closely and you'll see that they no longer have the same angles (you might have to enlarge the image).
If you draw somewhat complicated channels etc this is very annoying since longer trendlines don't match and look broken. Even if you have succeeded in drawing what looks like a correct chart, sometimes lines become unaligned if the y-scale is changed.
If you want to see the "wobble" effect, draw a longish line on the chart with about 45 degrees angle to the time axis and slowly drag it up and down, observing the endpoints.
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