Sony A7 not show Phase Point

[Xtian84]

Good morning everyone, I have just entered the Sony world with a Sony A7 first model.
But I have a problem with autofocus: I've turned on the phase area display, but when I activate the AFC and as an enforced Wide or Central Area area I don't see the precise points where I have focus.

As lens I use the Tamron 28-75 f2.8 which should work with Sony's phase detection. Where am I wrong? Can you help me?
Here are two examples by what I mean by "green squares of focus":

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