bug: Episode count per (season/year) is incorrect

Describe the bug

Episode count per (season / year) is incorrect.

Steps to reproduce

1. Delete an episode
2. Clear cache
3. Check episode count/season

Expected behavior

Count should be correct

Actual behavior

Count is not correct

Relevant logs and/or screenshots

Context

• Castopod: Pipeline 194
• OS: Spotted on both Ubuntu and Debian
• Browser: Firefox
• Web server: NGinx

Possible fixes

app/Controllers/Podcast.php, ~line 73 $episodesNavigation