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# 22/10/2024 - Upgrade staking accounting issue causing extra reward distribution

### What

Upgrading a locked stake allow user to claim rewards for past rounds for newly locked amount. \
Happens when users have unclaimed rewards and upgrade an existing locked stake.

### Impact

Too much USDC claimed by users. Leading to lack of liquidity in reward vault.

### Resolution

* Add a claim\_stakes cpi in upgrade\_locked\_stake instruction.
* Create a special instruction to inject extra USDC in the vault to be patch the USDC gap. 

### Details

**issue found:** \
**issue fix:** Orex and Corto\
**patch in**: Release/12 - Adrena Program v1.0.10\
**proposal url:**