Because I have stopped the subdivision algorithm at that precise point (fifth decimal place). I could go on further and provide many more of the decimal parts of the zeta zeros.
Highest zeta zero ever computed:
t ≈ 81029194732694548890047854481676712.9879 (zeta zero # 10
36 + 4242063737401796198).
https://arxiv.org/pdf/1607.00709.pdf1273315917355388788579148020712834 x 63 = 80218902793389493680486325304908542
1273315917355388788579148020712834 x 0.63636363 = 810291939305055209561529176768134.23182742
81,029,194,732,694,548,890,047,854,481,676,676.23182742
81,029,194,732,694,548,890,047,854,481,676,739.8681910581,029,194,732,694,548,890,047,854,481,676,692.40916072
(+16.1773333)
81,029,194,732,694,548,890,047,854,481,676,704.47514472
(+12.065984)
81,029,194,732,694,548,890,047,854,481,676,713.47347282
(+8.9983281)
81,029,194,732,694,548,890,047,854,481,676,709.78410162
(+5.3089569)
81,029,194,732,694,548,890,047,854,481,676,710.72208732
(+0.9379857)
81,029,194,732,694,548,890,047,854,481,676,711.42159955
(+0.69951223)
81,029,194,732,694,548,890,047,854,481,676,711.943267789
(+0.521668239)
81,029,194,732,694,548,890,047,854,481,676,712.332307089
(+0.3890393)
81,029,194,732,694,548,890,047,854,481,676,712.622437039
(+0.29012995)
81,029,194,732,694,548,890,047,854,481,676,712.838804339
(+0.2163673)
81,029,194,732,694,548,890,047,854,481,676,723.69085805
(-16.177333)
81,029,194,732,694,548,890,047,854,481,676,711.62487405
(-12.065984)
81,029,194,732,694,548,890,047,854,481,676,716.5720035
(-7.11885455)
81,029,194,732,694,548,890,047,854,481,676,715.3142453
(-1.2577582)
81,029,194,732,694,548,890,047,854,481,676,714.37625955
(-0.93798575)
81,029,194,732,694,548,890,047,854,481,676,713.6767473
(-0.69951225)
81,029,194,732,694,548,890,047,854,481,676,713.15507905
(-0.52166825)
Now, any other questions you might have, have been answered here:
https://www.theflatearthsociety.org/forum/index.php?topic=30499.msg2266386#msg2266386