Two accounts - receiving emails in both inboxes

So I use eM client for both my personal gmail and for work we have business gmail. I started noticing that some emails sent from my personal gmail, when people replied, it went into both my work and person gmail. This is obviously a big problem since my boss has access to my work email and I clearly don’t want him seeing some of the things I’m writing to buddies. Anyone else seeing this happen?

This definitely should not happen. Maybe you are looking in the smart folder, which would contain messages from all accounts? You can turn off smart folders at menu/tools/settings/general/general and deselect “Show smart folders”