What I have seen quite often are pictures of plants grown in sub-optimal conditions (not bad per se, but indoors for example) that may be exhibiting pest or other environmental stress.
I'm not denying the existence or possibility of TC errors cropping up from time to time, even from the best vendors. I am, however, saying that in my experience it's pretty rare.
In my case, I don't think you can say that the distortion/abnormalities I witnessed were the result of "sub-optimal conditions". I'll just leave it at that.
New photo from yesterday - N. bellii X aristolochioides: