I tried 3 types of rs nor latches and all of them act like clocks. They flash at the same speed as a comparator clock. The effect only occurs if you place down the torches last or give it a one tick pulse. You can stop it by powering one side. It will light up a lamp.
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I'm pretty sure this is a consequence of MCPE-11953.

I'm pretty sure this is a consequence of MCPE-11953.
That might be possible, I saw that in my search but I didn't think it was related.

That might be possible, I saw that in my search but I didn't think it was related.
Well it's hard to explain but let me try... Suppose we had an RS-NOR latch with two redstone torches Ta, Tb and redstone dust Ra, Rb. When Ta is activated, it powers Ra and then deactivates Tb. When Tb is activated, it powers Rb and then deactivates Ta. If we send a 1 tick on-pulse to the inactive side of latch, suppose this time it was Ta/Ra that was inactive,
At t=0 (initial state):
Ta is inactive, Ra is unpowered, Tb is active, Rb is powered.
t=1 (external on-pulse):
Ta is inactive, Ra is powered, Tb is active, Rb is powered.
t=2:
Ta is inactive, Ra is unpowered, Tb is inactive, Rb is unpowered.
t=3:
Ta is active, Ra is powered, Tb is active, Rb is powered.
t=4:
Ta is inactive, Ra is unpowered, Tb is inactive, Rb is unpowered. This is the same as t=2 and thus repeats t=2 and t=3 forever.

Well it's hard to explain but let me try... Suppose we had an RS-NOR latch with two redstone torches Ta, Tb and redstone dust Ra, Rb. When Ta is activated, it powers Ra and then deactivates Tb. When Tb is activated, it powers Rb and then deactivates Ta. If we send a 1 tick on-pulse to the inactive side of latch, suppose this time it was Ta/Ra that was inactive,
At t=0 (initial state):
Ta is inactive, Ra is unpowered, Tb is active, Rb is powered.
t=1 (external on-pulse):
Ta is inactive, Ra is powered, Tb is active, Rb is powered.
t=2:
Ta is inactive, Ra is unpowered, Tb is inactive, Rb is unpowered.
t=3:
Ta is active, Ra is powered, Tb is active, Rb is powered.
t=4:
Ta is inactive, Ra is unpowered, Tb is inactive, Rb is unpowered. This is the same as t=2 and thus repeats t=2 and t=3 forever.
Ok I think I understand. Thanks for the explanation.

Ok I think I understand. Thanks for the explanation.