It is possible that you did not receive WBNB and BIFI from the vault after you did withdrawal because you did not select the option to withdraw both tokens. By default, it uses LP when withdrawing, so if you withdrew as LP it is likely that it is sitting in your wallet but not visible. To ensure that you receive both tokens, you need to do two transactions - sign and withdraw. If you used LP, then you may need to go to the source farm to remove liquidity, be it Cone or Ape or Biswap. If you are using a BIFI-BNB LP vault, then you will need to head over to the respective dex to break your LP first. If it is not in your wallet, then it is possible that it has just disappeared.