Multiple collateral systems in DeFi are indeed increasing liquidation complexity. These systems allow diverse assets as collateral, complicating valuation and risk assessment due to varying volatility and liquidity. Cross-protocol interactions and reliance on oracles for price feeds introduce delays and potential inaccuracies, heightening the risk of untimely liquidations. Network congestion and high gas fees can further delay execution, amplifying bad debt risks. Protocols like Aave and Compound face challenges in calibrating risk parameters across multiple assets, as misaligned settings can trigger cascading liquidations. While innovations like cross-chain collateral and automated liquidation mechanisms aim to mitigate risks, they add layers of complexity, requiring robust audits and real-time monitoring to ensure stability.