You've noticed something that's at once obvious and subtle about astrology: opposite signs have a lot in common, and astrologers will work with these similarities. And it's very common that people with a strong sign placement will draw a lot of the opposite sign into their lives.
However, you were also reading Pisces birthday reports during a time when the ruler of Virgo was retrograde in its opposite sign, Pisces. So that was providing plenty of room for overlapping themes, since in many respects Pisces and Virgo have been fully merged for a few months. However, these two signs can seem strikingly similar, even to the oddest details, until you get far enough below the surface to see that Pisces really is Pisces and Virgo really is Virgo.