wordpress Comments error

I am having a problem in my WordPress site, when I create a new post or update a post to my site automatically get 2-6 comment by my post(Author is post title and comment is post content).i have to delete manually those comments. i am getting this error almost 10 days.i thought it might be theme or plugin but i check all of them by disabling. but the same thing happens if i disabled all plugin and use another theme.

I am using the latest version of WordPress and my host is siteground.my theme is updated. i am using generatepress theme and also i changed the theme to check but the problem wasn’t resolved.i couldn’t find any solution and don’t have an idea why this is happing.plz if you can help me with this problem.

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Author: jaman28