I was building my vertical item transporter when i came across this interesting bug, it only happens when there is a redstone torch on the turntable and there is a redstone dust below the torch... the video will explain it in further detail.
Also i dug out all around the torches as to make sure that they were not getting 'stuck' on the stone, but rather the dust!!
Video
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Magical Shit
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Syruse|Work: i like magic shit
MagikEh: ...
MagikEh: >.>
MagikEh: <.<
»» MagikEh walks to the bathroom
Syruse|Work: hahaaaaaaaaa
Syruse|Work: wait
MagikEh: xD
Syruse|Work: fuck
Syruse|Work: NO
Syruse|Work: DONT
Not a bug, that is how turntables work. When they receive redstone power they will change direction. This is the prime method for making semi-quick pulses for e.g. bellows. Locking the thread.