Sooner or later a solo session goes wrong in a very specific way. Your descriptors are clear, confident, internally consistent, and they do not match the target you were given. Most people file that as a miss and take it as evidence they cannot do this. Before you do, check the rest of the pool.
There is a name for it. Displacement is when a viewer produces an accurate description of a target in the set, just not the one that ended up selected. It is a recognized outcome in the research literature rather than a folk excuse, common enough in pool-based and associational work that experimenters build their protocols around the possibility.
Why it matters practically: displacement and blankness are different problems. Blankness means the perceptual side is not working yet. Displacement means the perceptual side worked fine and the addressing was ambiguous - the session had more than one thing it could reasonably have locked onto. Those two want opposite fixes, and grinding harder in session fixes neither.
Checking for it honestly is stricter than it sounds, because this is exactly the kind of finding that will confirm anything you want. Looking at three targets after the fact and picking whichever one your notes happen to flatter is scoring backwards. Decide the criteria before you look. Score the intended target first, in full, descriptor by descriptor, and write that number down. Only then check the others against the same standard. If the intended target scores at chance and another one scores well above it, you have something worth noting. If everything scores moderately, you have vague descriptors, not displacement.
The prevention is boring. Keep your exposure to the pool at zero: one target per session, chosen and sealed before you sit down, no scrolling the generator's other outputs, no batch-revealing three sessions in one sitting because you were lazy about feedback. If you have a practice partner, let them hold the pool - that is the single biggest thing a partner is actually for. Working alone, generate to a file you do not open and open only the one you worked.
Worth saying plainly, because the tag is full of people quitting three weeks in: a displaced session is not a failed session. It is a clean piece of descriptive work with a sloppy address on it. That is a protocol problem, and protocol problems are the good kind, because they are the ones you can actually fix.