Understanding weird performance of AST25120

Hello,

I purchased a pair of AST25120 tweeters and they don't conform to their specification at all. They don't have a flat response at all and can't produce any high. I don't think they are broken as their distortion number as low as my noise floor and DC resistance is 8Ohm. Also both brand new drivers measure exactly the same. I started questioning my equipment and measured a Dayton audio AMT mini 8 and I get a response curve very similar to their specification. Any idea what could be wrong there ? (I tried two different amplifier too).

PS I attach the measurements,

Thanks!
 

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