extremely low drop rate of common recipes

i farming mob for alchemy recipes (2 of them )

https://wotlkdb.com/?item=13491#dropped-by
and

https://wotlkdb.com/?item=21547

(mongoose and great firepower )

but also after i killed about 500-600 mobs who "would" drop it ...no recipes....maybe drop rate is wrong??

You can report bugs here: https://www.warmane.com/bugtracker

Here is a "confimed" report about "Elixir of the Mongoose" https://www.warmane.com/bugtracker/report/55013 but it is for TBC Core.

Maybe you can open a new report for Wotlk