Repeaters become a level pulse if two or more are connected in series(Also, without any redstone dust or a block between each repeater) and set to the same amount of ticks as a clock connected to them has. I think that the first repeater "stretches" the pulse, and then the second repeater glitches and thinks the stretched pulse is shorter than the original pulse, which would mean that the stretched pulse is shorter than the delay of the second repeater. This might cause the second repeater to stretch it again, but it stretches it into the next "glitch pulse" it receives from the first repeater, becoming a flat, unchanging state. (Doesn't occur prior to 1.8)
I tried doing the same thing, but putting a piece of redstone dust between both repeaters, and it worked like it should have.
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This link ( https://java.com/en/download/ ) will take you to java website you can find an update there. You are currently using 1.7.0 when 1.8.x is most recent.
As for your clock i find moving the series of Repeaters like 1 or 2 blocks further away from the loop should help even things out, (in my experience anyways.)
Are you talking about moving them away from the clock, or making a gap(of redstone dust) between the repeaters, because moving them away from the clock doesn't work, it still stays on. I've already mentioned redstone-dust gaps between the repeaters, the last sentence.
I meant move them further away.
I have tested it many ways, with no success. Try updating your java then try again. Let us know if the problem persists.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
[minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt) here.