>bigger than the 110g sticks

There are four 110g sticks per package because each one is one quarter of the classic one pound (454g) package of butter, rounded down.

The European equivalent is a 125g package, which is flatter and wider than your square-profile 110g sticks.

The 125 g package tends to be exclusive for more expensive brands though, or special stuff like salted butter. 250 g is the basic European packaging unit of butter, with the occasional 500 g for margarine.