Reason there is an 80 year gap between Cyrus decree to release Jews from Babylon and Artaxerxes decree to restore and build

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The 70 year period the Jews would be in Babylon would come to an end in 537/6 BC when Cyrus would issue his decree allowing them to return to Jerusalem.

The next important time element occurs on 457 BC when Artaxerxes will issue his decree to "restore and build" Jerusalem. This date, 457 is accepted by many to begin the counting of the 70 weeks of years prophecy.

So, the question is why are there 80 years between these two dates? And there is no such thing as a coincidence so they are made up of two 40 year periods and 40 is certainly a meaningful number in the scriptures. Thank you in advance, Charlie

Jer 25:11, 12 – And this whole land will become a desolate wasteland,
and these nations will serve the king of Babylon for seventy
years. But when seventy years are complete, I will punish the
king of Babylon and that nation, the land of the Chaldeans, for their
guilt, declares the LORD, and I will make it an everlasting
desolation.

Jer 29:10 – For this is what the LORD says: “When Babylon’s seventy
years are complete, I will attend to you and confirm My promise to
restore you to this place.