Bounty payout doesn't work on Brave

[Solexplorer]

Describe the bug

User cannot payout a bounty with Brave, even tho the wallet is connected to web3, he receives this issue:

And another error popped up when he tried again:

The user was able to payout the bounty with Chrome, so this seems a browser-related issue

This is the bounty in question: https://gitcoin.co/issue/PreventFlashLoanAttacks/Prevent-Flash-Loan-Attacks/3/100024084

Discussion here: https://gitcoincore.slack.com/archives/CAXQ7PT60/p1609680452250000

To Reproduce

I think you just need to test the bounty flow on Brave

Expected behavior

User should be able to pay out the bounty through Brave

Desktop (please complete the following information):

• OS: Linux
• Browser: Brave
• Browser Version: