We see this all the time when arguing with a side that doesn't care about the truth. Completely arbitrary, but I might say 10, and later find out 9. The other sides takes minor corrections/adjustments as fuel to say no, it must be 0 because the side saying 10 lied to you.
If everyone was really looking for the truth, this wouldn't be an issue because this is how science works. But, often one side is only pushing an agenda where the truth is irrelevant.