Discrepancy in Number of Entries for Chemical System “C-N-O”

Dear [Materials Project Support Team],

I am currently working with the Materials Project API and encountered a discrepancy in the number of entries retrieved for the chemical system “C-N-O”.

Using the API:

entries = mpr.get_entries_in_chemsys(elements=[“C”, “N”, “O”])

I received 203 entries.

On the Materials Project Website:

When searching for the same chemical system on the web interface, I see 202 entries listed.
Is there a difference in the way data is being filtered or presented via the API versus the web interface?

I would greatly appreciate your assistance in resolving this. Please let me know if you need any additional details from my side.

Looking forward to your response.


,why?

This is likely the same issue as in this thread, right?