Different heights! WTF?

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Hello guys. This is strange and i'd like to know if there is a similar case.

When i tape measured me the other day (in shoes), i noticed that i have less 7cm than the height i have in my ID card (also measured with shoes), renewed almost 3 years ago.

wtf? which one is wrong? because it's impossible to lose height, i'm just 28 years old.

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7 cm??? that's too much, even more at my age

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I think it was a wrong measurements by them. I height myself shortly after wake up too.

And since this time i height myself in shoes, the difference is maximum 1cm regarding that.
So 6 or 7 cms it's a lot. I can only think it could be a mistake