Have you ever had a conflict with QA engineers when you identified bugs that you felt were not actual bugs?

Yes, once I reported a UI glitch that appeared only on a specific browser version. The QA team marked it as a bug and scheduled it for the next release. I believed it was a rendering issue caused by a CSS override. I gathered screenshots, console logs, and a step-by-step reproduction guide, then set up a side-by-side comparison in a shared document. During a joint review session, we ran the test case together and observed that the issue did not occur on the latest browser build. The QA team acknowledged the oversight, and we updated the test suite to include the new browser version. This collaboration improved our defect triage process and reduced false positives.