comparator bug? or redstone bug?

Most of my redstone creations with comparators in them are broken. my redstone timers glitch where one side is constantly on without being powered while the other side isn't on. I've tested this with multiple comparator timers in multiple worlds and all of them don't work. when i went to 16w41a the timers worked perfectly fine after a block update. it might just be my computer but if it is not then i hope this can get fixed. i want my redstone back! <3