Comment dates all changed to match Post date

At some point in the past week or so the dates on all of our comments have changed to match the date of the original post.

So comments that were posted over a period of time changed to match the date when the post was first posted.

They didn’t change in the admin, just on the website, and no idea why.

Here’s our site:

http://www.younggogetter.com

You can click on any post and see the date issue.

We haven’t modified any code in months, so we’re scratching our heads.

Any help is appreciated. Thanks guys.