Narcissus Thalia changing colour!

Hi all, wondering if anyone else has experienced or heard of this happening. I planted some Thalia bulbs 2 or 3 yes ago, in pots. Year one they came up and were gorgeous. Pure white, double headed, amazing scent. Either year 2 or 3 they came up the same shape and fragrance but yellow!!! Unless someone has played an overly elaborate prank and replaced the original bulbs I have no explanation for it. Any ideas?
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There will be a simple explanation
I live in west central Scotland - not where that photo is...
Normal Ziva
''Abnormal' Ziva