Negative number of confirmations for a testnet transaction in blockexplorer

If you look closely at blockexplorer.com, you will notice that the site mentions that the transaction was included in block # 1484064. The blockexplorer seems to be confused about the height of the blockchaintip, or has other general problems related to the confirmation count. For example, it shows that all transactions in the last block have -3562 confirmations: Blockexplorer.com showing transactions in the last block with -3562

The transaction in question seems to have more than 1300 confirmations in other browsers, so it seems to be directly in blockexplorer.com.