One day, you may find the pipeline what you put on which was on grid. but is moved over night. There could be Admin. did something, or... something we don't know. Let's talk about the solution: At first, check the other "good" drawing's scale. Go to View--Property--Grid, then write down the scale number. see the attached picture. Then, go to your drawing which all lines moved. match the scale with the good one.
