Looking at DL/TRA14N for ANC-CLT using ZUJ method, fare rules tells me
[TRANSFERS]
2 TRANSFERS PERMITTED IN EACH DIRECTION ANY COMBINATION OF THE FOLLOWING
- 2 ONLINE ON DL. FARE BREAK AND EMBEDDED SURFACE SECTORS NOT PERMITTED
ON THE FARE COMPONENT.
but routing rules tells me
TRANSFERS - NOT PERMITTED
Now, what makes this even weirder is that I can price this fare code as 1/18 ANC-SEA-ATL-CLT and 1/30 CLT-ATL-SEA-ANC on DL.com (suggesting transfers are in fact permitted)--but the fare rules overview says transfers not permitted, while the full fare rules says two transfers each way.
So maybe this isn't a bug on your end after all
Still makes no sense though.