Butter buns McDonald's

I am so disappointed in your burgers it taste like butter, This never happened I left it the first time but this time I cannot leave it like that your buns has never tasted like butter before and mind you I am allergic to butter luckily I had my medication with me, I am highly disappointed that your buns taste like butter it's disgusting, please do change it because my whole family at home was complaining about it especially your Big Macs which tastes like butter, come on man guys do you lay it in butter or what, this is a health risk to me, Please up your game MCDONALD'S Promenade, please guys change your buns back to how it tasted and not like butter!!!!!!!!! I mean really now.