Jupyter mixes stdout and stderr output in non-deterministic order

Description

A dummy progress bar would be created after finishing each outer iteration, looking like below. The code to reproduce the issue is attached. It works fine without print though. Is there any way to avoid this behavior?

100% (100 of 100) |######################| Elapsed Time: 0:00:01 Time:  0:00:01
 16% (16 of 100) |###                    | Elapsed Time: 0:00:00 ETA:   0:00:01
0
100% (100 of 100) |######################| Elapsed Time: 0:00:01 Time:  0:00:01
 16% (16 of 100) |###                    | Elapsed Time: 0:00:00 ETA:   0:00:00
1
100% (100 of 100) |######################| Elapsed Time: 0:00:01 Time:  0:00:01
2

Code

import time
import progressbar

for i in range(3):
    for j in progressbar.progressbar(range(0, 100)):
        time.sleep(0.01)
    print(i)

Versions

Python version: 3.6
Python distribution/environment: Anaconda
Operating System: macOS 10.13
Package version: 3.37.1