Hello,
Filtering doesn’t work. What am I doing wrong?
Will be grateful for your help 
Which version of NocoDB are you using?
0.105.3
I experimented a bit and created this table via phpmyadmin. Could this be the cause of the problem?
If you’ve done some changes to schema via phpmyadmin. You will have to sync those ‘meta’ changes to nocodb. And here is the docs on how to do it.