The text box in the chain command block read: "[00:44:55] Source and destination are not identical" while the the source and destination clearly were identical. The input command was "/testforblocks 368 63 -182 368 63 -182 ~ ~-2 ~" and was testing for a named dispenser with a single wooden button in the center. Neither the source nor destination were powered.
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I'm not sure how to attach the world download. The site says it's too large of a file. However I can send screenshots of the setup.
This is the full setup. The source and destination are both in the picture. The destination being in the center of the circle and the source 2 blocks under the command block.
Invalid : The detection fail because their data value is different (see here and here).
When one of the comparator is activated, he will power the command block in front of him, and the blocks adjacent to the command block (see img).
You should really change your design to avoid powering adjacent command blocks, and put the dispensers far enough so that they don't get directly or indirectly powered.
Please attach a world download with signs pointing out source and destination area. Alternatively, please provide steps to reproduce this issue on a newly created world.