again, you didnt fly 5901miles. the 5901 number came from ANA.
your route (DEL-HND-SEA) is about 8451 miles. you're flying 8451 miles according to gcmap.com, ANA said you'll earn 70% based on distance flown , so 8451 * 0.70 = 5916 miles earned on ANA (their calculator said 5901)

you cannot take the number 5901, and apply it on United mileageplus because it doesnt make sense - United doesnt care what ANA said about earning 70% on P, United has their own calculation

https://www.united.com/en/us/fly/mil...tners/ana.html
Otherwise, you should reference the "Ticket number does not start with 016" section. footnote4 You'll earn miles based on flight distance footnote5 and the purchased fare class and/or fare class flown. footnote2

Discount Business Z, P 150%

in this case, how many miles will you earn if you put them in United MileagePlus?
do you understand the difference? this is what CPH-Flyer and myself are trying to tell you