It is hard to notice, but try to create 2 any components, create a wire between them. Now select the components and start moving them around the canvas; the more the components move, the greater the deviation of the wire.
Yes it is a UI thing (drives me crazy as well). You can select the components and realign with the black icons that show up around the edges of the selection.
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Yes, I constantly have to use the alignment options 
I just wanted to bring this problem to the developers