Face serum changes color- Help!

Hi everyone! I got an issue with a water only serum formulation which after a month changes color and from being clear turns greenish/brown. The formula is the following:

Water
Propanediol
Butylene glycol
Hyaluronic acid
Saccharomyces Lysate (Blend with aminoacids and Disodium Succinate)
D ribose 
Inositol
Xantham gum
Acrylates/C10-30 Alkyl Acrylate Crosspolymer (Ultrez 20)
Arginine
Caprylyl glycol
1,2 Hexanediol
Phenoxyethanol
Ethylhexylglycerin
Disodium EDTA (0.2%)

I suspect that the issue has to do with the presence of the sugars ribose and inositol. Any suggestion would be greatly appreciated! Thank you

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