Wherever inheritance is on topic people quote those verses of the Qur'an, were we read the similar sentence:

... for the male, what is equal to the share of two females ... (see for example 4:11 and 4:176)

This is lately often used by modern Muslims or feminist Muslims to call for an (share) equality between both genders!

This amount might even differ (increase) in some cases as quoted in the Qur'an, but is this a kind of injustice towards women?

What is the secrete or logic behind this division?

Note that I've heard a scholar saying that in fact in most situation it is the male who inherits less than the female, I'd be interested in a commentary/explanation on that!
Also note that the missing part of the verses above is quoting children or more exactly the inheritance shares of siblings from their parents only, not all possible cases of inheritance!