Sort of the MCPE-equivalent of MC-107795, which was fixed in 16w41a.
See this video for a demonstration/explanation:
https://youtu.be/tLeW3lhMn_0
Observers redirect redstone (like a repeater/comparator/adjacent dust), which makes no sense. In a future update redstone dust will automatically connect to adjacent components with inputs, but this doesn't apply in this instance, because the Observer only takes input from one side, and as you can see in the picture and video, it's redirecting no matter which side is adjacent to the dust. To make it even more confusing, the redirection doesn't appear visually, so the redstone dust still looks like it is in the shape it would be otherwise. A proper fix would be to make the Observer only redirect redstone on its output side. This is how it works in the Java edition.
I think this bug may be related to MCPE-11871 and MCPE-16170.
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Confirmed on Samsung Galaxy S6 (SM-G920W8), Android 5.1.1 MCPE 0.15.1. The redstone dust is incorrectly powering like an L junction into the observer block when it should be powering the lamp as the line junction. This bug happens regardless of the orientation of the observer block.

Confirmed on Samsung Galaxy S6 (SM-G920W8), Android 5.1.1 MCPE 0.15.1. The redstone dust is incorrectly powering like an L junction into the observer block when it should be powering the lamp as the line junction. This bug happens regardless of the orientation of the observer block.

Confirmed on Samsung Galaxy S6 (SM-G920W8), Android 5.1.1 MCPE 0.15.1. The redstone dust is incorrectly powering like an L junction into the observer block when it should be powering the lamp as the line junction. This bug happens regardless of the orientation of the observer block.

Confirmed on Samsung Galaxy S6 (SM-G920W8), Android 5.1.1 MCPE 0.15.1. The redstone dust is incorrectly powering like an L junction into the observer block when it should be powering the lamp as the line junction. This bug happens regardless of the orientation of the observer block.

This dose happen still on 0.15.2, thats so weird how did that get glossed over. Well its still a bug that exists

I think this bug may be related to MCPE-11871 due to their similarities.

Having checked out MCPE-16170, I think this bug may also be related to it as well.

This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).

This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).

This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).

This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).

Still happens in 1.0.7
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Still happens in 1.0.7
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Still happens in 1.0.7
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Still happens in 1.0.7
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Still happens in 1.1.2
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Still happens in 1.1.2
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Still happens in 1.1.2
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Still happens in 1.1.2
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Fixed in 1.2.5 beta build 2
The output side only of an observer now redirects redstone both visually and functionally.
Fixed in 1.2.5 beta build 2
The output side only of an observer now redirects redstone both visually and functionally.
Fixed in 1.2.5 beta build 2
The output side only of an observer now redirects redstone both visually and functionally.
Fixed in 1.2.5 beta build 2
The output side only of an observer now redirects redstone both visually and functionally.