[ARCHIVED] Submission API - wrong Attempt

[tom12]

Canvas API question : 

/api/v1/courses/{id}/students/submissions

 if this includes a return of Submission History , then i can see all the Attempts on a Quiz.

But i am noticing that the Attempt in the Canvas application does NOT match what I am getting back from the API?

See below that the application has my last Attempt as 524.

BUT the API link above returns submission history with the 524 Attempt as 535??? I do see the "preview_url" is containing the correct attempt as version=525?

[submitted_at] => 2020-10-19T12:38:20Z
[assignment_id] => 1375
[user_id] => 9
[submission_type] => online_quiz
[workflow_state] => pending_review
[grade_matches_current_submission] => 1
[graded_at] => 2020-10-19T12:40:12Z
[grader_id] => -1886
[attempt] => 535
[preview_url] => https://honorlock.instructure.com/courses/115/assignments/1375/submissions/9?preview=1&version=525

ALSO - is the "submitted_at" returned as UTC? or the users timezone?