Oddly Wired
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bias

You remember your contributions as disproportionately large.

Egocentric bias causes you to overstate your personal impact on group outcomes.

You have constant access to your own thoughts and efforts, but only limited access to others'. When recalling a project, your brain prioritizes your own internal experience. This leads to the consistent feeling that you did more work than your teammates.

Your memory of contribution is inherently skewed.

Where this comes from

Study
Ross and Sicoly, 1979
What the check found
This is a well-established finding in social psychology (Ross and Sicoly, 1979), though it is not explicitly contained in the provided reference text.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.