All the time! People propose hypotheses, supported by some preliminary data, and then they need to be tested. Some problems are easy, some take years or decades to be overturned. It's messy sometimes, but that's how science is supposed to work!
I think if we were closer to ideal science, we'd work harder to verify numbers as a first step. More replication means stronger foundations and less wasted work.
There will always be some bad results that stick around for a long time before being overturned. But the median lifetime of bad results can change based on how we prioritize research. That statistic might currently be far from optimal.
However, I wanted to commend your reply. It seeks to educate without judgement. Cheers.