I wouldn't worry about this - I'm not sure if someone told you differently, but if they did, they are an idiot. You had a PR - it is a record and it doesn't always indicate what you can do on an average day. You are looking far too much into this.
My advice is to get stronger. Keep pushing so that your squat is 585x15. But I'm sure others will want you to "walk out heavy weights" or other such nonsense. At some point, at usually it is the first 10 years of consistent training - you have to push and get stronger.