In every retro I run, we spend most of the time on what broke, what we missed, what to fix. The wins get a quick nod before we move on to the problems. My team walks out of those meetings feeling like the whole stretch was a failure, even when it wasn't.
More people experience this than they realize.
Your team retros dwell on failures, so people leave feeling like they fell short.
If this sounds familiar, the Library can help you find the bigger picture.