Inaccurate meters are a major pain. I was struggling with this just a few weeks ago. My BD meter seemed to consistently be high (compared to other meters and when I felt hypo symptoms). Just when I was about to throw it out the window, a new batch of sensors were delivered. The new batch were probably manufactured at a different facility (new packaging, company was recently bought out, etc.). The new batch consistently read 20 - 30 lower than the old batch of sensors. And the new batch agreed well with my other meters and how I felt. So I’m happy now with my meter and current 3-month supply of sensors.
You never know if it’s the meter or the sensors that could be the problem. But what a frustration it is.