Why do I only ever seem to get Morgott's stupid fucking curved sword as a legendary for Wylder?

There are 5 fucking actual legendary greadswords that I have never gotten in 80 hours. I traded Godfrey's Axe for Sacred Relic sword once. Last night I all 3 of us got morgotts greatsword from city Astel and the raider gave the other wylder his so he could powerstance.