Pedal lines acting weird. Please help

I'm trying to add overlapping pedal to a part of my song. Whenever I add the pedal line, and I go to a new section on a different line, add another pedal line, the previous pedal line from the other line changes, it shifts higher. It happens every time when I try to add a pedal line. I've made a video of it to show what I mean. I've added a link to my google drive video as I can't add videos in here. I don't understand why this is happening, and I can't seem to fix it because every time when the pedal shifts, I add the pedal line again, then in another part of my music, the pedal line shifts again, and it just keeps happening. I can't manually fix it either, because if I drag it higher, the line is never at the same height as the other line so it doesn't look neat. Please help me. Thank you!
https://drive.google.com/file/d/1YWG6uGhbR1sBc0jS4VBEw4PwU9e4NL9i/view?…