Augustin changed the packaging of the individual strings some time ago.
Now e1 and d4 are in one, b2 and A5 in another and g3 and E6 in the third envelope, which enables a direct comparison of somehow corresponding treble and bass string.
Anyway, though the visual appearance might be different, the basses actually are slightly thicker than the trebles in the said order. In case yours are thinner, that wouldn’t be normal!
Augustin Classics Black are dedicated for use in standard tuning and BTW was THE reference for Nylon strings in the past!