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Since you have confirmed the chain length to be correct, I think the next step is to confirm the number of teeth you have on your sprockets, if you have not already. From there we need to really get crazy and measure the length of the swingarm from pivot point to the end and compare to another bike.
This is not right. It's not just about the end caps; the axle is obviously not positioned in the intended spot in the slot.
Without meaning to insult you (I don't want you to stomp off in a huff), I think you need to recount the chain links. The most likely culprit here is that the dealer installed a 112 link chain on your bike.
Good to hear that the mystery is no more!
Since you are able to use the bike, I would probably leave it. If you can, I'd suggest putting the caps on convex, and if you can't get the 12mm locknut over the 14mm nut, then go get a nylon self locking nut instead. As your chain wears you'll get out into a more usable range on the adjusters.
Assuming the dealer service caused all this grief, I just shake my head and sigh . . .
y
Yes, the chain is exactly how it left the dealer after the swap, it's about the only thing on the bike I haven't mucked with, lol. . :/