Sounds like “you might have chosen” the default “Categories view” on th new eM Client V10 installation, where your incoming mail gets sorted into different Inbox tabs like Primary , Other, Promotions, Social etc depending on the type of mail account you have.
You can enable or disable any category you want or disable them all via Settings (Preferences).
See @Gary post in the following thread.
Example - eM Client V10 Mac Categories enabled in a Gmail account.
Now “if you don’t have Categories enabled”, then go to “Menu / Rules” and see if there are any rules setup to eg: automatically move incoming emails to other mail folders. You can dblclick the rules to look inside them including the blacklist.
The blacklist in V10 is via “Menu / Settings / Mail / Blacklists and Whitelists”.
Also when you are in Rules you can select between Local and Server rules via the dropdown at the top to see if any Server rules are setup