In the website I am working on there is a javascript pop-up (jquery) that appears if you enter an incorrect input into a text field. However, if there is a label to the left of that text field it gets pushed to the right.
Would anyone have some insight as to where this might be occurring, or what the cause is?

This is probably what is happening…
So left margin is pushing the image out as the label extends down. You could try floating it right and then having a right margin pushing it over instead. It’s hard to make a good suggestion without seeing the rest of it.