'Playing scene selecting background instead of button?

I'm trying to select this buttons clicking in Ch.1 as Chapter 1.

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And as you can see in the image, when I click the buttons, it will just select the objects in that area except the buttons:

enter image description here

Clicking again chapter 1:

enter image description here

For me it's a surprise that when the tablet gets selected I see the object is not even the pdf viewer, it's just a decoration.

enter image description here

Here are the layers:

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enter image description here

Buttons are configured as layer UI:

enter image description here

I've tested to change the layer UI to teleport to see if it's a layer level problem but didn't make any difference.

Please let me know if there is any information missing in this question, I'm very new to Unity3d.

Why is mouse selecting those items instead of clicking the buttons?

unity3d


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