Python3.x Jupyter Notebook 拒绝打印一些字符串

我的笔记本中正在丢弃一些print()输出，但我看不到任何特定的模式或原因:

s = 'https://ad.doubleclick.net/'
t = 'ttps://ad.doubleclick.net/'
u = 'https://ad.doubleclick.net'
v = 'https://ad.doublclick.net/'
w = 'https://pubads.g.doubleclick.net/gampad/ads?caps'

for string in [s, t, u, v]:
    print('str:', string)
    print('repr(str):', repr(string))
    print()

输出:

str: 
repr(str): 'https://ad.doubleclick.net/'

str: ttps://ad.doubleclick.net/
repr(str): 'ttps://ad.doubleclick.net/'

str: https://ad.doubleclick.net
repr(str): 'https://ad.doubleclick.net'

str: https://ad.doublclick.net/
repr(str): 'https://ad.doublclick.net/'

str: 
repr(str): 'https://pubads.g.doubleclick.net/gampad/ads?caps'

我的第一行和最后str:行怎么了？ 只发生在笔记本电脑上，在终端运行Python解释器不会有这个问题.

Python3.8.5

> which jupyter
/Library/Frameworks/Python.framework/Versions/3.8/bin/jupyter

> jupyter --version
Selected Jupyter core packages...
IPython          : 8.0.0
ipykernel        : 6.7.0
ipywidgets       : 7.7.1
jupyter_client   : 7.1.1
jupyter_core     : 4.9.1
jupyter_server   : not installed
jupyterlab       : not installed
nbclient         : 0.5.10
nbconvert        : 6.4.0
nbformat         : 5.1.3
notebook         : 6.4.7
qtconsole        : not installed
traitlets        : 5.1.1