The phrase "a puzzling aspect of" is correct and usable in written English.
You can use it when discussing something that is confusing or difficult to understand within a particular context or subject.
Example: "One puzzling aspect of the theory is its lack of empirical support despite its popularity in academic circles."
Alternatives: "a confusing element of" or "a perplexing feature of".
Kessler points to a puzzling aspect of Rice's record.
Now we are on this subject of sex, I am keen to resolve a puzzling aspect of all this.
To the Editor: Paul Kengor doesn't come to terms with a puzzling aspect of the president's foreign policy: Which of two very different philosophies is guiding this president?
Both reflect a puzzling aspect of Brown's career that combines high-minded intent, a very real desire to serve the public good, with a fatal streak of insecurity.
A puzzling aspect of the Hong Kong situation is that most relapses appear to have occurred among patients at Princess Margaret Hospital, which specializes in respiratory diseases, and United Christian Hospital, while none have been reported from the Prince of Wales Hospital, which treated the first wave of cases.
And it points to a puzzling aspect of Don't Ask Don't Tell: Why would we want soldiers, who might some day be generals with a voice in policy (and they often do have one), to keep secrets that could destroy their careers?
A most puzzling aspect of the epidemic is the low rate of infection among health workers who cared for SARS patients in China, Dr. Stöhr said.
A final puzzling aspect of the mitochondrial results is the anomalous patterns shown by the Euarchontoglires – the group that contains both rodents and primates, and so all of the most highly studied mammalian models.
Although the modeling studies mentioned so far, dealing with a variety of different processes in HIV infection, have been quite successful in advancing our understanding of HIV biology, a puzzling aspect remains: these models do not necessarily include an explicit immune response.
For social scientists, it's an object of research, offering clues to a fundamental and puzzling aspect of human nature: People need to belong, to feel a part of "us".
From a US perspective, the puzzling aspect of UK Uncut's focus on finding alternatives to austerity is its resemblance to the current Republican party line.
