Ai Behaviour tree flicker problem

Development Programming & Scripting AI
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I wanted to try out some basic Ai behaviour trees so I follow the UE4 documents tutorial here:
https://docs.unrealengine.com/latest/INT/Engine/AI/BehaviorTrees/QuickStart/14/index.html

I have never done behaviour trees before and im a beginner when it comes to blueprints, so I followed each step and looked over it a few times to make sure I wasn’t missing anything (I previously missed changing the multishpere radius). Im sure it is 100% the same as the documents now but I am having trouble with the Ai walking to you when you are in its FOV. The behaviour tree flickers between the root and move to task when you are in its sight but the ai moves normally when you are not in its sight.

I can’t seem to find I fix, the only answer I could find was to build the navmesh, though it didn’t fix it.
Any help or information would be great!

Here is a video to better understand what I mean:

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I fixed it, it was just a simple oversight on my half.

On the ‘‘RapidMoveTo’’ blueprint I had the top right pin on the AI Move to node go straight into the finish execute node, I just had to unlink the pins and use the On success pin instead.

http://puu.sh/t9OBa/f32f14911d.jpg

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If that doesn’t succeed though, won’t you end up stuck in that task?