It is not the normal calamary but the ones called 'abyssal calamary'.
But yes, It is true. As many respawns in oramond the calamary respawn it is not constant; I mean, if you hunt in the east minotaur, you will realice that there is not always the same amount of amazon, execouter, hunters, etc; same happens in the glooth factory.
This is what happens with the abyssal calamary, sometimes the calamary spawns sometimes the crustacea does in the same spot.
I leave you a link that explains it better with the spots ^^