Unable to retrieve my liquidity MOON/ETH on sushiswap.

Hi people,

I'm becoming desperate. I provided some MOON/ETH liquidity on sushiswap. I stacked my LP tokens I got, and I got rewards up to almost 2 moons and some sushi. I didn't claim the reward (and now the reward is gone...).

I want to remove my liquidity ASAP. When I select any amount to withdraw from the LP, the blue button to withdraw is never activated. Clicking on it doesn't do anything. I tested with 2 different web browsers (Firefox and Chromium), on 2 different computer and I face exactly the same issue.

I went to the Discord channel of sushiswap, and opened a ticket. Then the helper told me "you seem to have ran into a rpc bug, please kindly connect your wallet to custodialbrowser.com". Seems like a scammer to me. I mean, connect my wallet, i.e. give my seedphrase to a 3rd party website? Uh... really?

Please help me!