You’re definitely not alone here; something’s changed with Cafe Mocha for the worse.
I’d contacted Soylent support back in January about quality control issues with Cafe Mocha. I’ve been getting it for over two years, and only starting with my boxes in January did the taste seem way off–like super diluted, watery chocolate milk with a very slight coffee taste (not so much metallic taste, that I’ve found). I’d rate the bottles from the January orders maybe a 6/10 (and sometimes below that for some bottles). Normally, Coffiest/Cafe Mocha tastes to me like straight-up coffee with cream and a slight chocolatey taste.
For comparison, I haven’t noticed any drastic changes in flavor like this for Mocha or Strawberry, just Cafe Mocha.
I was able to get replacement orders back then for the bad ones in January, but the replacements really didn’t fare much better in the flavor department.
It’s definitely concerning since I order Cafe Mocha more than any other flavor, and I’ve had to resort to delaying my Cafe Mocha subscription through Rosa Labs and getting mine from Amazon now, like you. Their stock has tended to be older and still the flavor that I expect.
However, the bottle type doesn’t seem to be a factor in my experience; through my Soylent subscription, I’d been getting Cafe Mocha rocket-style bottles for several months last year, and they’d tasted normal until January.
The bottles I’ve gotten from Amazon are mostly the sqround-style, though some boxes have been the rocket-style, and all I’d rate at least 7/10 or above in flavor (so within the realm of what I expect).
I’ve been keeping track of the batch numbers on the bottles to better determine what may be happening here. I’ve shared with the support team a few minutes ago the batch numbers I’d consider good and those I’d say are bad, so hopefully we’ll be able to find out what’s going on.
I can’t see myself continuing my Rosa Labs subscription until the issue is for sure sorted, and I’m not sure for how much longer the stock that Amazon has will taste ok. I have gotten some boxes with later expiration dates that still taste ok, so there seems to be pretty spotty quality control now. In case location matters since I believe you get stock made nearest you, I’m in the upper East Coast area.