Old 05-25-17, 01:02 PM
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It does look like the pulleys are not even with the last sprocket- It's possible your derailleur hanger is mis-aligned.
That is the first thing that I noticed, also.

In addition to that, it appears that your chain wrap on the small sprocket, contacts less than half of the cog teeth. Moving the wheel back, fully, might correct that situation and solve the problem.

More often, than not, however, any chain skip I have experienced is a result of a worn chain and/or sprocket. Significant wear in the chain will not allow for the chain to contact all teeth the same amount, allowing it(the chain) to climb up over the teeth and skip.
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