I’ve not seen this discussed previously, but have noticed it on my recent logs.
The attached DropBox folder contains three subs (NGC6543, 0017, 0018 and 0019). Subs 0017 and 0018 report sop-west in their title. Sub 0019 reports sop-east. Both 0017 and 0019 are correct. However, 0018 is actually sop-east (vs. sop-west).
No biggie, just looks like the cart got before the horse on this.