To reproduce:
1 place a block with a button on top
2 place a repeater facing out that block
3 place on the other side of that repeater a sticky piston in the ground with a block on top
4 face another repeater out that block
5 place a block with a redstonetorch on top
6 torch doesnt deactivate
(This is not a bug in the texturepack)
Tested on both SMP and SSP
Is this still an issue in the current Minecraft Snapshot 15w46a or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.