Heading to "Far Lands", when either the X or the Z coordinate gets greater than 8388607 (0x7FFFFF) or less than -8388608, the flame of torches, normal or redstone, is displaced by half block on the axis of this coordinate.
This can be reproduced by placing a torch at 8388608,?,0 (or greater).
See included screenshot:
the torches to the left (on 8388607 and less) are OK;
the one being looked at (on 8388608) has its flame to the left
the ones to the right (8388609) have the flame to the right
I only tested this in creative mode, but I believe this will happen in all modes.
Plausible