That is the site trying to search the TXID on the non-existent block chain explorer.
We are working on an updated version of the site and putting a blockchain explorer on site.

Once the DROP block explorer is finished and put online all transaction links will work properly.

For now you can search your TXID on the bottom of the site to see its position in repayment list.
Also, You can search the TXID in the DROP client as well to make sure its been committed to the chain.