Card sticky doesn't work

i have implemented this template in my web, but card-sticky doesn't work.

when i scroll in your demo everything works fine and some styling is added in the card header class, i guess this is added to the header to resize and take up the space as it should be

im gonna add some gifs, showing the problem
[showing the problem in my web]
https://media.giphy.com/media/D4VtGpHqlwkTz4Mcit/giphy.gif

[Your demo]
https://media.giphy.com/media/goU1r9JtCcaoOPnOdM/giphy.gif

Please help me!

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