The difference between delinquency amount and loan amount on a default notice.

[Rich Van Huesen]

What’s the difference between a loan amount and a delinquency amount. 
When it comes to default information? 

I’m looking to invest but want to the numbers so it make sense for the seller as well. 

Basically took a mortgage in 2005 for $520,000. Now there’s a delinquency amount of $270,000 and a loan amount of $104,000. (Default information) 

Help understand how’s this possible and what’s the difference between delinquency amount and loan amount?