Copying UI element causes element to repeat itself in build (solved)

using Unity 5.1.0.f3

I'm making a mobile game, where the UI elements pop up only when needed - to avoid a cluttered interface.

I had a handful of working elements, both buttons and images. But as I recently copied an existing button, the element repeating itself (as opposed to clamping I suppose) across the screen in both x and y directions. This only happens in the build, not while running in Unity.

This did not, and still does not, happen to any of the older elements - it happens to all the elements I create now.

I tried copying the entire project to a new folder, as this fixed a UI bug, where the inspector items got lost. But this has not helped.

Does anyone have any ideas?

Thank you

 

So I found out what was wrong and how to solve it, in case anyone else experience the same bug in Unity.

The canvases and/or EventSystem had been corrupted. The UI elements were fine.

So I had to create new canvases in a new scene and could copy over the old elements.

The only things that got lost in the process was:

1. the order of the elements in the canvas and
2. the elements had translated all scales to positions;

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The latter was most likely due to the fact that the old canvas had lost its canvas scaler script.