My droppers aren't working. I'm standing on a repeater. If I replace this repeater with a redstone dust, 3 droppers will work, but the other 2 still won't. If I move this repeater 1 block to the east (left in the screenshot), 3 droppers will work but the other 2 won't. There is apparently no simple way to get all 5 droppers working. (I'm absolutely sure that this is a redstone glitch because the droppers do work if I trigger them manually with a lever next to the line of redstone dust.)
I wanted to include a zip file of my world, but it won't let me because it's 117 megabytes. So the best I can do is a bunch of screenshots.

Edit: Well, I tried some more and did find a workaround, and that involves moving the second repeater (the repeater that separates the 3 droppers from the 2 droppers) 1 step west. So the old coordinates of the repeaters were:
-84.5, 63.125, -43.5
-75.5, 63.125, -42.5
And the new coordinates are:
-83.5, 63.125, -43.5
-74.5, 63.125, -42.5