I right clicked a Lava Egg on an EnderIO Tank and it...
overflowed.
Hatchery: Latest (On Curse)
EnderIO: Latest (On Curse)
Ender Core: Latest (On Curse)

If you don't know what I mean, here's a screenshot.

Ah. Chickens has the problem...

Fist question. Is it a hatchery egg or the lava egg drop by the lava chicken. Screen shot the egg if your not sure.

lava chicken

Its all cool our mods are closely tied together.. he gets my issues sometimes.