Issues in spectra shape - Cary 60

I'm having issues in my carry 60 (SN MY13500004). After the software update, the Agilent field engineer ran some performance tests. In the wavelength accuracy (Xenon Lines) he detected the weird shape of spectra (see image). Whats the cause of this ?

 

I checked the lamp align and intensity, everything is ok. All the tests in validate software passed.

 

tks a lot guys.

 

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