Order of episodes on DVDs

Anyone else notice that on the DVDs from MPI, a number of the episodes are out of order? And quite blatantly so. Disc 5 features The Musgrave Ritual and The Man with the Twisted Lip, both of which pre-date the episodes on Discs 3 & 4. That, however, is not the only discrepancy. In detail:


Episodes in order of broadcast (excluding 2-hour features):

The Empty House
The Abbey Grange
The Musgrave Ritual
The Second Stain
The Man with the Twisted Lip
The Priory School
The Six Napoleons
The Devil's Foot
Silver Blaze
Wisteria Lodge
The Bruce-Partington Plans


Episodes in order of appearance on DVDs:

The Empty House
The Abbey Grange
The Second Stain
The Six Napoleons
The Priory School
Wisteria Lodge
The Devil's Foot
Silver Blaze
The Bruce-Partington Plans
The Musgrave Ritual
The Man with the Twisted Lip


Anyone know how this mix-up occured? In some cases, it is supremely obvious, just by watching the episodes, that they are misplaced. In the two episodes on Disc 5, for instance, Holmes's hair is slicked back, as in the earlier episodes...not cut in the style of the later "Return" episodes. And in The Musgrave Ritual, Holmes is obviously shooting cocaine...which immediately dates it prior to The Devil's Foot, when he kicks the habit. In fact, when viewed in the order that they are presented on the DVDs, it may appear to the untrained eye as if Holmes has relapsed into his cocaine usage.

One would think that they'd be able to get the order correct, no?