When a user stake dust amount, slash() might round the total slashedAmount to 0, resulting in 0 amount slashing.
https://github.com/code-423n4/2024-03-gitcoin/blob/6529b351cd72a858541f60c52f0e5ad0fb6f1b16/id-staking-v2/contracts/IdentityStaking.sol#L443
Disallow dust amount staking. 
Alex the Entreprenerd (judge) commented:
