Why does liquidity not added if I launch the safemoon code?

I have deployed a contract (safemoon code), and I´m doing some test. The problem is that I´ve put a 8 % liquidity tax, but when I sell the tokens the liquidity doesnt rise. This is the contract:

https://poocoin.app/tokens/0xf0b244a3b3dd1ceb677b4aa347e01daeba7689d1

Where is the problem??? If someone can help me I will reward.

Thanks

can someone help me???