API /projects/{id}/members doesn't list all members

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When I try to get all members of a project which has more than per_page members, some of members are repeated on different pages of json. For example, if I set per_page=1, I get the same user at second and third pages.

Platform (Android, iOS, Website):
API

URLs (aka web addresses) of any relevant observations or pages:

Screenshots of what you are seeing (instructions for taking a screenshot on computers and mobile devices: https://www.take-a-screenshot.org/):

Description of problem (please provide a set of steps we can use to replicate the issue, and make as many as you need.):

Step 1:
Go to
https://api.inaturalist.org/v1/docs/#!/Projects/get_projects_id_members
Fill the form with values:

key value
id flora-of-russia
page 2
per_page 1

https://api.inaturalist.org/v1/projects/flora-of-russia/members?page=2&per_page=1

Step 2:
Look to the user in result (id": 830550,“login”: “woodmen19”)

Step 3:
Change page to 3

https://api.inaturalist.org/v1/projects/flora-of-russia/members?page=3&per_page=1

Step 4:
Look to the user in result (id": 830550,“login”: “woodmen19”). It shouldn’t be the same as the second page.