Eating stacked Half-Eaten Calamari items consumes all items in the stack, acts as 1 object and returns only 1 bowl. e.g. have a set of 6 Half-Eaten Calamari, attempt to eat 1 of the 6, all are consumed, only 1 bowl found in inventory and only 1 unit's worth of hunger restored.

Running v1.2.2b from Agrarian Farms

Ahh didn't know about the name in 1.7.2. There's a lot of instances of that.
I'll have a look in to this then, thanks for reporting.

Happens the same too in 1.7.2 along with Half-eaten calamari not getting a proper name. (It still got the code defined name)
Also it is funny that you get two different Calamari from ONE Squid if you got Pam's Harvestcraft installed xD. Wonder if you two could collab to put make them Ore Dictionary compatible?