First time I've experienced this on one of these.
Guide number 7 on the stapler unit develops a nick in it from normal usage which catches only the fist sheet and stops it going all the way back into the stapler. All sheets after it go over the top of it to the back no problems.
Screen Shot 2016-11-04 at 3.17.36 pm.jpg
Good news is that it works without it just fine. Remove it and problem solved.
This is what the nick looks like:
IMG_0261.JPG
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