Prior to solidity version 0.8.0, hitting an assert consumes the remainder of the transactions available gas rather than returning it, as require()/revert() do. assert() should be avoided even past solidity version 0.8.0 as its documentation states that The assert function creates an error of type Panic(uint256).  Properly functioning code should never create a Panic, not even on invalid external input. If this happens, then there is a bug in your contract which you should fix.
There are 18 instances of this issue:
https://github.com/code-423n4/2022-05-velodrome/blob/7fda97c570b758bbfa7dd6724a336c43d4041740/contracts/contracts/Router.sol#L36
https://github.com/code-423n4/2022-05-velodrome/blob/7fda97c570b758bbfa7dd6724a336c43d4041740/contracts/contracts/VotingEscrow.sol#L262
https://github.com/code-423n4/2022-05-velodrome/blob/7fda97c570b758bbfa7dd6724a336c43d4041740/contracts/contracts/RewardsDistributor.sol#L98
