BDO Codex

Hello. Since Nov 7th update patchnotes introducing new fishes, fish enclycopedia pages number have changed, don't know if that is what affected your links:

Example with "Frilled Shark" : https://bdocodex.com/us/item/821015/
The fish guide link redirects to "Swellfish" : https://bdocodex.com/us/article/8/

Personally, I would have preferred to add the new fishes at end of the encyclopedia list to not invalidate previous documentation but hey! I am not BDO developer so...

Thanks for reporting this!
So what those devs did is this: they decided to add all of those new fishes as fishes with a new type and IDs starting from zero again... So in result IDs were not unique anymore and we got wrong links there.
Fixed it by adding 10000 to IDs of all new fishes. Now we have proper links and no overlapping values anymore. Fixed missing icons in Encylopedia along the way too.