Without any specific detail (your link brings up a blank page) it's difficult to be certain but ...
My guess is that they're giving quite a wide orb to Jupiter's transits. Jupiter itself was at 23Pisces back at end of April, moved forward 10 degrees to 3Aries in mid-July and has since retrograded back to 23Pisces.
IF you were to have natal Jupiter at 28Cappy or 28Taurus and IF you gave the sextile transits an orb of 5-6 degrees then you could claim its been in sextile for all that time and will be until Feb. BUT I'd say that's too big an orb for a transit.
This article suggests 1degree for sextile transit orbs (e.g. 59-61degs) and 2degs in the natal chart (e.g. 58-62degs) although acknowledges some astrologers use up to 5 degrees.