Random image appears in the center of the screen while using scrollrect

Hey, guys!

So I upgraded a project from Unity 4.7.2 to Unity 5.5 so I can do a Windows 10 Universal build. I cleared all of the obsolete/deprecated code but there is a super weird bug that happens all the time.

As you can see there is a random image appearing in the middle of the screen, not part of the “tubing”. I tried selecting it from the Scene view but there is no such object in the hierarchy.

So yeah, I have no clue what to do about it. Tried reimporting all assets, restarted unity, remade the prefabs that I use. Can you please suggest something?

Thanks!

For anyone wondering, I just started all over again with the original 4.7.2 project but this time I upgraded it to Unity 5.4.0 and had no problems with that random image at least for now.