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The "Anomaly of Plato" is a name for the fact that Socrates promoted Truth as a transcendent idea but (according to Popper), Plato did not allow for the immanent changes that Truth causes. Truths naturally cause changes, because when realities are known, change occurs.
The current comprehension of the anomaly is explained in more detail at these two links:
Follow up about first comprehension
Is this really an anomaly?
The reason for this particular Platonic anomaly, and generally for all Platonic anomalies, is that he used commonly understood ideas from the cultural storehouse of his time as stand-ins for the often quite different concepts that he wanted to illuminate.
Platonic Truth, like all Platonic ideals, is a perfect, unchanging, eternal "entity" that exists outside of ordinary reality. It has only a loose relationship with regular, ordinary, small-T truths, which are always changing.
This can be seen clearly in Plato's idea of the noble lie which is, in his view, a big-T truth despite being a little-f falsehood.
A motivation for existence of the "anomaly of Plato?", is, most probably, Socrates and Plato were two different persons with different philosophical views. The anomaly partly came into existence because their views are often construed together as Platonic, instead of Platonic and Socratic. Socrates thought change/movement was best, but Plato, maybe, favored stasis as the favorable human condition.
To properly comprehend the two different philosophical views, comprehension and inner knowledge of hermeneutics and its mechanisms are relevant.
"It was at Athens, too, that public opinion was convulced, on the eve of the Sicilian Expedition, by the mysterious and ominous mutilation of certain public statues, the 'Hermae', or busts of Hermes. The disasters which followed were attributed by some to this sacrilege. Socrates the Athenian philosopher who became, thanks to his pupil Plato, the archetypal figure of the man of intellect, and left as a maxim the view that 'the unexamined life is not worth living', offended the pieties of his state and was condemned to die for it by his fellow-citizens; he was also condemned for questioning received astronomy. It does not seem that similar trials took place elsewhere, but they imply a background of popular superstition which must have been more typical of the Greek community than the presence of a Socrates." (Roberts 1995: 193)
ROBERTS; J.M. 1995. The Penguin History of the World. London, England: Penguin Group, 3rd edition.
