My best friend used to be a little like that as well with TV volumes. We often play games together, and I adjust the volume on his TV accordingly. He used to complain whenever it was set to an uneven number until he got used to me doing that.
Looks like it's a common OCD thing.
He also has an issue with items having their own place too and I have to always put them back in the same location and position that I found them in. But meh, he keeps his room tidy that way I guess. :P
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