mootokens are receipts for staking your LP tokens on Beefy. You deposited your tokens on Spookyswap to create LP tokens and then staked the LP tokens on Beefy Finance. Is that correct?

On spookyswap they will reward you with BOO tokens if you staked it in their farms. But if you stake on Beefy, they will sell those BOO tokens to create more LP tokens for you automatically. So your LP token position will increase over time.

APY was high previously because there was less total value locked. Now that total value locked is higher, yields have dropped. It's about 20+% APY now.