Why have my coins reduced over night?

https://cashwalklabs.moneple.com/uk/3920175

Pretty sure yesterday I had enough for an Amazon voucher (6250). Decided to not redeem yet & today, I seem to have lost at least 1000 coins?!!!! How? I've just tried to redeem & it says I don't have enough. When I pressed redeem yesterday by accident, it came up with the security thing to sign in to receive code to redeem etc. 

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