well i just discovered this on myself hope it helps those who have problem sealing cause of too-long secret answers.
ok so lets say your secret question is "whats my mom's name"
n the secret answer is " priestdro faggot queer penis"
obviously thats too long of a secret answer, so just type "priestdro faggot" when ur sealing items.
worked for me (when i typed the 1st 2 words of my secret answer)