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have been bedevilling

  • present perfect progressive
    of bedevil.
    bedevil
    verb (used with object)
    to torment or harass maliciously or diabolically, as with doubts, distractions, or worries.

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Those updates should shrink the error bars on the telescope’s calibrations from the tens of percentage points that have been bedevilling astronomers in some areas, down to just a few percentage points.

From Scientific American Oct. 11, 2022