From the copy:
Heartsong: Attuned + PEACE. The deepest foundation in our catalog. PEACE returns you to the whole, unforced self beneath every role, and Attuned carries that wholeness into love.
It was an issue specific to the individual.
To be clear, without calling out who it was (and as a Regular I’m sure you know how to figure that out), the individual has been using several other subs, its possible the number of rest days for dealing with recon was too low, and there is/was past trauma involved which I would suspect is one of the difficulties causing the identity confusion.
I’m not Saint, but I’d say for an experienced sub user it shouldn’t be an issue. The problem is that despite the listening guidelines and the legal warnings, not everyone is aware until they start working with subs that hit deep on the specific issues the qualities and measure of things that are in their subconscious/greater mental storehouse, so it is best to tread cautiously in those circumstances, emphasise self care and being kind to yourself, and not overdo it. And also, washouts when needed.