Kabayan. I've been in the bitcoin and cryptocurrency space for like 3 years already and I've never heard of this "Bitstring Wallet". It's a less known wallet and not to mention that it's CLOSED SOURCE. I'm not saying na scam yang wallet na yan, but I personally wouldn't trust it.

If you have funds remaining on your Bitstring wallet, GET THEM OUT. Use a reputable wallet like Mycelium instead. Or if you were to trust a custodial wallet anyway(with username and password instead of a recovery seed), leave it on Coins.ph instead.