error setting expiration when adding new assignments

[hawkrobe]

I uploaded a HIT with 9 assignments (1 batch) set to expire in 1 hour and then a few minutes later decided to add a few more assignments:

➜  nosub -p status
Running on production
ID                              Created                Expiration            Assignments  NumPending  NumAvailable  NumCompleted
------------------------------  ---------------------  --------------------  -----------  ----------  ------------  ------------
3FTID4TN8LYCH8GR30YO1PFCULVLY0  9/26/2019 12:26:22 PM  9/26/2019 1:26:22 PM  9            3           0             6

Total available: 9
Total completed: 6

➜  nosub -p add 2 assignments
Running on production
Cost will be $2.64
Account balance is $155.24
Creating new batches. Setting expiration to current maximum Thu Sep 26 2019 13:26:22 GMT-0400 (Eastern Daylight Time)
Created batch 3VO4XFFP15M4TL038WGK5YU90TBQ7X

➜  nosub -p status
Running on production
ID                              Created                Expiration             Assignments  NumPending  NumAvailable  NumCompleted
------------------------------  ---------------------  ---------------------  -----------  ----------  ------------  ------------
3FTID4TN8LYCH8GR30YO1PFCULVLY0  9/26/2019 12:26:22 PM  9/26/2019 1:26:22 PM   9            3           0             6
3VO4XFFP15M4TL038WGK5YU90TBQ7X  9/26/2019 12:59:36 PM  9/30/2019 12:59:36 PM  2            2           0             0

At the time of adding assignments, it says 'setting expiration to current maximum' and shows the correct time, but when I called nosub -p status, it's set to 4 days later.