We've checked that offer and didn't see any incoming transaction to the buffer wallet from your side.
You can verify this yourself by opening the Deposit Timeout deal in the My Deals page and clicking magnifying glass icon (next to the copy button in the address field).
It looks like the status was changed to Deposit Timeout because no funds were received in the buffer wallet.
If you are sure you deposited test BTC, please send us the TXID of your transaction so we can investigate the issue.
That is strange.
I am 100% sure I sent transactions with testnet4 and it was confirmed on the blockchain, and I saved all the proof.
Only thing I could think of if something related with testnet ethereum addresses, since they have Sepolia, Holesky and maybe few more testnet chains.
Please check your PM for transaction I sent you.