HI,
it seems there is an error in producing DETFOO files for tiles around the Equator.
If you take a look at an example from the product
S2A_OPER_PRD_MSIL1C_PDMC_20160102T014441_R039_V20160101T150922_20160101T150922
and granule 19NEA
you will see, that it is significantly too large.
There are lots of similar examples (all around Equator)
Regards
Grega
PS: we sent this to support e-mail but received no response