I'm guessing subscribers haven't received their latest copies yet (27 & 28, charged on the 14th)?

Nope, and also charged on the 14th.
Because I'm a nerd with a rage against Hachette's customer service I've been keeping a log of my payment/arrival dates, with one or two uncertainties where I was away:
Issues 03-04 paid 22 Sep arrived 29 Sep/06 Oct?
Issues 05-06 paid 20 Oct arrived 02 November
Issues 07-08 paid 24 Nov arrived 05 December
Issues 09-10 paid 22 Dec arrived 08 Jan
Issues 11-12 back-ordered 18 Jan arrived 22 Jan
Issues 13-14 paid 02 Feb arrived 09 Feb
Issues 15-16 paid 30 Mar arrived 10 April
Issues 17-18 paid 27 Apr arrived 09 May
Issues 19-20 paid 25 May arrived 04 June
Issues 21-22 paid 22 Jun arrived 03 July
Issues 23-24 paid 20 Jul arrived 31Jul/1Aug?
Issues 25-26 paid 17 Aug arrived 28 August
Issues 27-28 paid 14 Sep arrived
In other words, it's late based on recent trends, but not record-beatingly so.
</nerd>