There is no credit in situation you wrote it is 1.45 debit if stock close below 595 you will get 5 $ if above 600 you lose 1.45. In your case it is debit spread.
You sell 600 and buy 595 on July 21 then there is 2 $ credit. Hope it help.
Sorry , I had to take off the rest of the day. It looks like your question was answered. However, the 595wp had a high of 3.45 today. Did you mean the 605wp in your question?