Almost got scammed – now I can’t send SOL or swap tokens anymore

Hey everyone,

I’m having a serious issue with my Solana wallet and I’m hoping someone here might have seen this before.

Earlier today I connected my wallet to a website to vote for a token. The page prepared a transaction and showed all tokens in my wallet. That looked suspicious, so I did NOT sign it and cancelled the transaction.

Since that moment my wallet behaves strangely.

Current situation:

• I can receive SOL
• I cannot send SOL to external wallets
• I cannot swap any tokens
• wallet swaps fail
• swaps via Jupiter fail
• most transactions fail with “Transaction simulation failed – invalid program argument”

However:

• my funds are still in the wallet
• no tokens were transferred out
• I can send tokens to myself
• I can move tokens between my main and legacy address

I already tried:

• Backpack wallet
• Phantom
• Solflare
• mobile and browser extensions

Same issue everywhere.

Has anyone ever seen something like this?
Is it possible that cancelling that transaction left my wallet/account in some broken state?

Any help or ideas would be greatly appreciated.

Translated it with Chat-GPT :D englisch isn´t my mothertongue