Problem with different wavelengths

Hi,  I'm having some troubles with an Agilent 1260, running a method for vitamins A & E.  Vitamin A without any trouble at 325 nm, but the vitamin E (205nm) fluctuates the size of the peak (about half of the expected size). 

Changed the lamp and column with no effect. 



Moving the mobile phase (Methanol:Acetonitrile 50:50) and the column to other HPLC the system works OK. 


Can someone help me? Thanks! 

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