I doubt that Richard Feynman’s IQ was really under 130. It seems more likely that he didn’t take the test seriously.
Possibly or he had what David Treffert called savant syndrome. Where very rarely a normal person,or in this case high normal, can exhibit savant type abilities in more than one area in spite of his/her “limitations”.
From wikipedia: "In high school he was bright, with a measured IQ of 125: high, but "merely respectable" according to biographer Gleick.[10] He would later scoff at psychometric testing."
He was born in 1918 so the test he took would have been different from that given today.