What are those collateral addresses starting with a 7 ? (Dash addresses start with an X)
Also be informed that it shows not just legacy nodes, it also shows already updated nodes.
Please make sure it only shows nodes with older protocol versions (older then 70218).
These are multisig wallets, typically they almost always belonged to SALT lending. Not sure these days. As for the user_agent check, there is a lag time where the crawler takes about 24 hours to get to through the entire network and check the user agent of each node, so it is always lagging somewhat, the balance and POSE score however, is correct to the minute.