i dont want to post urls open in the forum but this happends to every site you changes domain on.
if you want to set your thread to private, we can help you on this.
By the way, if you didn't enable this setting "Use relative path" from backend before you create those blog post, it will stored it as absolute path, you can check my attached screenshot below.
To fix your existing blog post for those existing image path to use relative path, need to manually run the custom PHP script to update it.
May i know how many domain site having this issue?