Planet of the Apes #16: The Newton edition

Newton Comics' Planet of the Apes #15 is cover-dated March 1976:

The cover image originally appeared on Marvel's Planet of the Apes #13.

Terror on the Planet of the Apes Phase 2: The Magick Man's Last Gasp Purple Light Show, originally published in Planet of the Apes #13, October 1975

Two People Who Are The Planet Of The Apes Part II, originally published in Planet of the Apes #13, October 1975

Escape from the Planet of the Apes Part 1: Upward to the Earth, originally published in Planet of the Apes #12, September 1975

Escape from the Planet of the Apes Part 2: Strangers in a Stranger Land, originally published in Planet of the Apes #13, October 1975

The contest in this issue expires 31 January 1976. Clearly this doesn't tally with the cover date. It doesn't even tally with the contest expiry date on the previous issue, which was 28 February 1976 for a January 1976 cover-dated issue. Consider also that the only in-house advertisement is for Daredevil #1, which has a January 1976 cover date, and the letter column appeared in other issues cover-dated February 1976, and this issue skipped a month in its schedule - so something clearly went awry.

There is no poster in my copy, nor are there any pages missing.