issue.fields.timeestimate returns most results in seconds, one result in minutes

[Deleted user]

I'm writing a simple time analysis script, and hitting an anomalous result.  When I query the value for issue.fields.timeestimate, I get a value in seconds for almost every issue in my query except one, which returns a value in minutes.  I can't find anything unusual about that issue.  Can anyone help me understand why one issue might be reporting differently?

Code (python 3.7):

issues = jira.search_issues(open_cases_JQL)

for issue in issues:
    print (issue.key, issue.fields.timeestimate)

Results:

IRR-12 3600
IRD-24 3600
IRD-19 1170
IRC-124 3600
IRC-115 234000

Time estimate value in text from each issue:

IRR-12: 1h
IRD-24: 1h
IRD-19: 2d 3h 30m
IRC-124: 1h
IRC-115: 1w 3d 1h

IRD-19: 2d 3h 30m = 19h 30m = 1,170m = 70,200s

IRD-24: 1h = 60m = 3,600s

Why am I getting a value in seconds for one, and a value in minutes for another?