Multiple Meta Descriptions on Indexable Pages

I am encountering an issue with multiple meta descriptions being detected on my indexable pages. This is affecting the SEO performance of my website. Here’s a summary of what I have done so far to resolve the issue:

1. Checked All in One SEO plugin:
   I reviewed the settings in the All in One SEO plugin to ensure no meta descriptions were defined, but I found that no meta descriptions were set there.
2. Edited header.php:
   Based on recommendations, I removed the meta description line from the header.php file, but the issue still persists. Despite these efforts, the error continues to show multiple meta descriptions.

This issue is affecting the search engine optimization of my website, and I need assistance in identifying where the additional meta description is coming from and how to resolve the problem.
Could you kindly help me find a solution to this issue?