Hmm, I got a similar feeling about the word flipping meanings, as you put it, when "of" is added after. And the supposition that the word's similarity to "compose" causes this flipping sounded plausible to me. So, those scientific folk who began using "comprised of" in the 19th century have foisted a mistake upon us, and literary people have accepted it more and more since?
However, my Webster's Unabridged suggests that the "of" added afterwards did not itself flip the meaning around. Let me copy out the relevant explanation:
"
Comprise has had an interesting history of sense development. In addition to its original senses, dating from the 15th century, 'to include' and 'to consist of' ('the USA comprises 50 states'),
comprise has had since the late 18th century the meaning 'to form or constitute' ('fifty states comprise the USA'). Since the late 19th century it has also been used in passive constructions with a sense synonymous with that of one of its original meanings 'to consist of, be composed of': 'the USA is comprised of 50 states'. These latter uses are often criticized, but they occur with increasing frequency even in formal speech and writing."
So
comprise had both uses for a century before "comprised of" came into use. Adding "of" does not have anything to do with changing the meaning of the word, then. It seems to me that certain definitions or synonyms of
both comprise and
compose will not make any sense if you put an "of" after them, so we can't use that as an argument against using "comprised of".
Are there other problems you have with the phrase? At this point I'd say two things. One, if anything we should teach people to avoid "is comprised of" because it is unnecessarily passive and because the shorter "comprises" works just as well. Two, for the sake of preserving the power and precision of English we should perhaps use "comprise" so as not to overlap with "compose", and vice versa. But note that here we deal only with "comprise" which in fact *does* flip both ways and overlap with "compose" (see Webster's above), before the "of" is even considered.
Many interesting considerations comprise this discussion.
