Fake Butterfly free chack?

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I bought 100ml bottle of bty free chack two years ago. Recently I used the rest of the glue, so I bought 500ml bottle of it( I glue rubbers for almost half of my club now...). Today I used it for the first time and it felt different. It had totally different and even stronger smell compared to my old one. Also this new chack is white when dried but the old one was rubbery yellow. I shaked the new bottle for a long time before use. Is other of these fake? Has formula the changed?