Why is my money missing from MetaMask?

Could you please help me understand why the funds in my MetaMask wallet seem to have vanished? I've double-checked the balance, and it's definitely not reflecting what it should be. I'm quite concerned about this unexpected disappearance. Could it be a technical glitch, or could someone have accessed my wallet without my knowledge? I've always been cautious with my private keys and have never shared them with anyone. What steps should I take to investigate this matter further? Your advice would be greatly appreciated as I'm feeling quite perplexed and anxious about this situation.