Same here, was trying to find where to report the "BUG" .
ALL of the crafting writs have this issue, I'm lvl 50 on all and making them in wrothgar too.
note: I went to the delivery point and even though they didn't say to go there,
I was able to turn them all in ! ! ! They just don't mark as completed. On;y the 1st part you do counts, the rest get stuck !
I have a clan-member who's lower lvl and it won't move him to the next drop off point as it's stuck & he hasn't been there yet !
I do these EVERY day ! It needs to get fixed/patched .
I cleared cache on the ps4, rebooted, logged in/out, changed characters, completed something else . . . nothing!
I also deleted the stuff for the writ, re-did it & still no fix !
edit note: This is doing this AGAIN, after the HIST patch .