Got lucky for a companion voucher booking next May/June

Flying out on May 25th LHR to San Diego in Club

Flying back on June 12th from San Fran to LHR in Club

The issue came when the AVIOS was charged at peak on the flight back

According to the online booking it had intimated it was Off peak however the CS staff member told me it was peak as Sunday nights are peak?

Am I right or was the CS staff member right and the online view incorrectly showing as Off Peak??

My thought was it should be 62500 x2 125000, but we were charged 137500

Thoughts?