I'll describe a very subjective quirk of cognition, hope others share this and maybe have some insight.
The oddity appears while weighing choices, and, especially when trying to recall something I'm uncertain of. Let's say I want to remember someone's birthday, and I'm pretty sure it's either February 28th, or March 5th. Say I have no way of checking these empirically. I begin to think about these items, but not as a group - I take each one in turn to explore the validity of it. This is a "feely" exercise. Normally with good memory I'd have a strong feeling of certainty about the item, and continue thinking without questioning it. But no such feeling associated with things uncertain. If it's one thing that feels weak, okay I can attack that full force and make up my mind about it. But something different happens when I'm weighing weak multiple choices, like the example of two possible birthdays.
I feel as though I mustn't think too strongly about a particular possibility, lest the act of thinking about it leaves "weight" behind. I feel that "weight" would later deceive me to feel certainty about the item. For example if I think very hard on Feb 28th, but not about March 5th, then give up: later when I try to recall the birthday February 28th will stand out strong, and I'll feel certain of that date.
So I employ a strategy of lightly touching around such options, careful to apply equal pressure. I've learned the technique from experience. It's similar for dream recall, but with dreams more a sense that if I "put my foot in it" I'll scatter the arrangement.
If my gentle dancey attempts to feel out the correct option fail, I often rather leave the question on hold. Leaving it carefully balanced just as I found it, I tell myself, "Try not to think about it."