Hi Tim,
This is speculation on my part, but here's what I think happened in producing the 2 chips you show --
I'm guessing that these chips were manufactured by Dolphin casino products in Australia.
On their website, and in the downloadable pdf sales brochure, they show a diagram of their "Decal Value Chips", which is what they call the Dunedin Casino chips in your picture.
Note that the buyer can specify an edge pattern and INNER RING OPTIONS. The inner ring is where the $5 denominations are located.

I'm guessing that their injection mold tool is a 2-part configuration, where the inner part is interlocked inside the outer edge part of the mold. It's likely that the inner ring rotates and is locked in place before injection molding begins.

I think the chip on the right in your picture is the correct orientation, with the $5's spaced between the edge inserts. On the left-hand chip, I think the set-up was NOT correctly oriented, resulting in an incorrect placement of the inner ring $5's. So, I would consider the left-hand chip to be sloppy quality control and/or an "error" chip. As to rarity, it depends if lots of the incorrect chip were delivered and circulated, or if only this one, or a few, slipped through their quality control.

The Dolphin website page is:
http://www.dolphinproducts.com.au/ChipRange.php