quite

No. The sentence is correct.

Thank you for your reply.
I'm still confused, though because 'quite' is an adverb, not an adjective
so how can one say "that are not quite" without any omitted noun or adjective?

Not quite here means not completely, or not entirely.

Thank you for your reply which makes the sentence's meaning clear!
Could I ask one more question?
The reason why I'm confused is 'quite', 'completely', and 'entirely, are all adverbs, not adjectives or nouns.

For example, I doubt if following two sentences are right.
- They are not compeletely.
- We had intended them to be competely.

I suppose these following fou

Would it help if you thought of quite as an adverb modifying that are not?

langtravelerFor example, I doubt if following two sentences are right.- They are not compeletely.- We had intended them to be competely.

No, those won't work.

langtravelerI suppose these following four are correct gramatically although I

Thank you for your reply, Blue Jay!
That's why I cannot understand 'quite', an adverb is there, as a complement.
- "details that are not [complement]"
- "we intended them to be [complement]"

- the original sentence is:
We cannot help but notice details that are not "quite" as we had intended them to be.

I guess where 'quite' is put in needs an adjective or noun f

langtravelerWe cannot help but notice details that are not quite as we had intended them to be.

We cannot help but notice details that are not completely (the same) as we had intended them to be.
We cannot help but notice details that are not completely (what) we had intended them to be.

CJ

langtravelerThat's why I cannot understand 'quite', an adverb is there, as a complement.- "details that are not [complement]"- "we intended them to be [complement]"

We cannot help but notice details that are not quite as we had intended them to be.

The complement of are is the underlined prepositional phrase (PP), in which the adv

Thank you very much Calif and Anonymous user!
Now I see how it is written.