Don't think 62K is actually a saver award. You searched for a roundtrip award ticket and being show roundtrip pricing, but are only being shown the outbound flight option. Complete the outbound flight selection and then see what return flights are being offered. The 62K roundtrip option almost certainly involves BA metal on the return and is getting a carrier-imposed surcharge tacked on, while the PE/J return options likely do not involve BA metal and thus no surcharge