BUG: Get element from series of dtypes.value_counts() by index don't work most of times
### 

- [x] I have checked that this issue has not already been reported.

- [X] I have confirmed this bug exists on the [latest version](https://pandas.pydata.org/docs/whatsnew/index.html) of pandas.

- [X] I have confirmed this bug exists on the master branch of pandas.


### Reproducible Example

```python
import pandas as pd
df = pd.read_csv('https://stepik.org/media/attachments/course/4852/titanic.csv')
dt = df.dtypes.value_counts()
print(dt)
print(dt.index)
print(dt['float64'])
print(dt['object'])
print(dt['int64'])
```


### Issue Description

I'm trying to get the number of columns of a particular data type. This code should work correctly, but most of times in crashed with KeyError on different keys. For example:

```python
int64      5
object     5
float64    2
dtype: int64
Index([int64, object, float64], dtype='object')
2
5
Traceback (most recent call last):
  File "/home/kizhifox/coding/stepik/venv/lib/python3.8/site-packages/pandas/core/indexes/base.py", line 3361, in get_loc
    return self._engine.get_loc(casted_key)
  File "pandas/_libs/index.pyx", line 76, in pandas._libs.index.IndexEngine.get_loc
  File "pandas/_libs/index.pyx", line 108, in pandas._libs.index.IndexEngine.get_loc
  File "pandas/_libs/hashtable_class_helper.pxi", line 5198, in pandas._libs.hashtable.PyObjectHashTable.get_item
  File "pandas/_libs/hashtable_class_helper.pxi", line 5206, in pandas._libs.hashtable.PyObjectHashTable.get_item
KeyError: 'int64'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/kizhifox/coding/stepik/test.py", line 8, in <module>
    print(dt['int64'])
  File "/home/kizhifox/coding/stepik/venv/lib/python3.8/site-packages/pandas/core/series.py", line 942, in __getitem__
    return self._get_value(key)
  File "/home/kizhifox/coding/stepik/venv/lib/python3.8/site-packages/pandas/core/series.py", line 1051, in _get_value
    loc = self.index.get_loc(label)
  File "/home/kizhifox/coding/stepik/venv/lib/python3.8/site-packages/pandas/core/indexes/base.py", line 3363, in get_loc
    raise KeyError(key) from err
KeyError: 'int64'

Process finished with exit code 1
```

I have also tried downloading the CSV file and using dt.get() to access the values, but that also didn't work.

### Expected Behavior

Expected output (approximately every 10th launch is displayed):

```python
int64      5
object     5
float64    2
dtype: int64
Index([int64, object, float64], dtype='object')
2
5
5
```

### Installed Versions

<details>

INSTALLED VERSIONS
------------------
commit           : 73c68257545b5f8530b7044f56647bd2db92e2ba
python           : 3.8.10.final.0
python-bits      : 64
OS               : Linux
OS-release       : 5.11.0-34-generic
Version          : #36~20.04.1-Ubuntu SMP Fri Aug 27 08:06:32 UTC 2021
machine          : x86_64
processor        : x86_64
byteorder        : little
LC_ALL           : None
LANG             : ru_RU.UTF-8
LOCALE           : ru_RU.UTF-8

pandas           : 1.3.3
numpy            : 1.21.2
pytz             : 2021.1
dateutil         : 2.8.2
pip              : 20.0.2
setuptools       : 44.0.0
Cython           : None
pytest           : None
hypothesis       : None
sphinx           : None
blosc            : None
feather          : None
xlsxwriter       : None
lxml.etree       : None
html5lib         : None
pymysql          : None
psycopg2         : None
jinja2           : 3.0.1
IPython          : 7.27.0
pandas_datareader: None
bs4              : None
bottleneck       : None
fsspec           : None
fastparquet      : None
gcsfs            : None
matplotlib       : None
numexpr          : None
odfpy            : None
openpyxl         : None
pandas_gbq       : None
pyarrow          : None
pyxlsb           : None
s3fs             : None
scipy            : None
sqlalchemy       : None
tables           : None
tabulate         : None
xarray           : None
xlrd             : None
xlwt             : None
numba            : None

</details>