My own opinion, for what it’s worth:
If there’s only one inappropriately formatted answer, disqualify just that answer. It may have been a typo or an “everybody makes mistakes”-type lapse.
If there’s more than one, disqualify the whole entry. That shows disregard for the rules, and an entry with multiple disqualified answers probably wouldn’t be competitive anyway.
But really, I’d go with whatever’s easiest for you.
Per the OP:
Entire entry but give new feuders a second chance, I know I made a couple of mistakes when I first started playing.
Ok, that sounds fair. I will have to ask that other Feuders point out (or PM them) their mistake, though, and they can repost within the time limit. I might not get back in time.
I can’t always keep up with how new a “new” Feuder is.
How does that sound?
Nuke them from orbit. It’s the only way to be sure.
And b. Entire entry.
Joe
b) entire entry
Thanks for continuing to do the feuds. You rock!
Do you need some sort of label for reposted entries, or does your magical scoring spreadsheet make them obvious?
The whole entry. As previously mentioned, it’s not rocket science, and also, it’s just an online Feud game. Getting dq’ed from one game shouldn’t be a huge deal. You learn your lesson, you come back and play the next one.
Entire entry!
Then I’ll be #21 instead of 22!
Seriously - the entire entry should be disqualified. This is The Dope - we need to follow the rules.
Seconded as to both. Many thanks!
My vote is for disqualifying the whole entry if there is a lack or understanding or disregard for the rules.
I do not see a problem with reposting a corrected answer sheet before the deadline but we should not have to police it for who is new or should know better. They should catch it themselves. I know everyone is hurried but once you post you can proofread and edit for 5 minutes.
I mean, it’s a daily feud, what’s the worst that could happen… they have to sit out until tomorrow? Seems a fair punishment to me.
No, it’s not magical! I’d just have to notice there is a second one. Actually, it won’t matter, because their first entry won’t be entered into the spreadsheet, so I would just put it in normally.
There seems to be a concensus already!
And you guys rock, too! 
Make the whole entry disqualified.
Entire entry.
Me too.
I’d be inclined to say whole entry, but I think Dolores gets to make the rules, as she does the work.
And on review, it looks like we have a conch going!
I second this, although I saw what you said. It’s not like we’re off doing the work grading these things. It’s simple enough to follow the rules, although also I tend not to read your rules every time since I’ve done tons of Feuds, they’re almost always the same and I want to be careful not to read into the other contestants answers. It can be tough to spot when there’s a tweak.
Big red NEW RULES! wasn’t a clue? 
a) only disqualify poorly-formatted answers
I don’t see that it matters that much. First of all, how common is it for someone to mis-format on some but not all of the answers? Second, if an entry has disqualified answers in it, even if the valid ones are still counted, the disqualifications are probably going to be enough to sink that entry’s total score into the basement.