PyCharm Stopped Showing Errors in Code

Here are my Pycharm details, 

PyCharm 2022.2.4 (Community Edition)
Build #PC-222.4459.20, built on November 17, 2022
Runtime version: 17.0.5+7-b469.71 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Linux 5.15.0-53-generic
GC: G1 Young Generation, G1 Old Generation
Memory: 2048M
Cores: 16
Non-Bundled Plugins:
    com.jetbrains.plugins.ini4idea (222.4459.20)
    zielu.gittoolbox (212.10.1)
    ru.meanmail.plugin.requirements (2022.4)
    Docker (222.4459.20)

Current Desktop: KDE

The problem is, Pycharm stopped showing any kind of errors in the code in the problem tab under the editor. 

As you see, the only complaint it has is a trivial one about some blank lines, when actually the code has multiple undefined variables and syntax errors. Part of it is my fault because at some point, I right clicked and by mistake removed the problem tab from the sidebar. Somehow I brought it back, but now it is failing to show any error. Before the accident, it was not only highlighting undefined name, but also helped me import/define it. 

Even when I run pylint on the same file, this is a sample of what I am getting, along with a score of -14/10 (never seen pylint giving negative score). 

celery_worker.py:28:0: E0602: Undefined variable 'logging' (undefined-variable)
celery_worker.py:29:26: E0602: Undefined variable 'logging' (undefined-variable)
celery_worker.py:31:0: E0602: Undefined variable 'tf' (undefined-variable)
celery_worker.py:35:8: E0602: Undefined variable 'Celery' (undefined-variable)

How can I set up pycharm to show every possible error (including in function arguments and undefined variables) and apply the strictest possible standard like it was doing before?