The Sinai Palimpsests Project's own venues disagree on the erased-text language count — 11 (Phelps 2023) vs. 10 (UCLA Newsroom and the project website), the gap being Coptic

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Michael B. Phelps's 2023 peer-reviewed retrospective states the project's headline result as "Identification of 307 discrete erased texts in 11 languages," and gives a full undertext breakdown by page count: Greek 3,058; Syriac 1,617; Georgian 710; Christian Palestinian Aramaic 479; Arabic 436; Caucasian Albanian 276; Armenian 118; Slavonic 115; Latin 83; Ethiopic 34; Coptic 2 (Phelps 2023, pp. 35–36) — eleven languages by that table. A UCLA Newsroom press release from December 2017, the year after the project's 2011–2016 run concluded, instead states: "The Sinai Palimpsests Project contains 74 palimpsests totaling some 6,800 pages in 10 languages and containing erased layers of writing from the fifth to the 12th centuries." The project's own "About the Project" website page gives the same "10 languages" figure.

The arithmetic explains the gap rather than deepening it: Coptic accounts for only 2 of the project's 6,800 pages, the smallest of the eleven languages by a wide margin, and both venues reporting "10" appear to simply omit it — whether as an editorial rounding-down of a marginal case or an earlier tally taken before Coptic material was catalogued is not stated in either source. This is the same shape as the monastery's unsettled "known palimpsests" total and the 305-vs-307 erased-texts correction from the same project: Phelps's later, more granular academic account is consistently the fuller and more authoritative figure against the project's own looser promotional-venue numbers.