Often when copying and pasting a flow the lines of the old flow behave oddly. Here is a simple example: the lines going to the bottom most Browse tool take an extra loop. If the flow is more complex, there result might be quite curious circles.
The reasons seems to be that Alteryx tries to fit the lines nicely to accommodate the pasted items. However, this functionality should be disabled when pasting items to the canvas. Mostly this is a small nuisance, but adjusting items and the lines back might take a small time and break the workflow.