This is working as intended. The link you're seeing is intended to be a permalink to a specific post, in order to make sure that your post links will always work, regardless of the user's "posts per page" settings.
To elaborate: Let's say the forum sets the default "Posts per page" to 20. You, on the other hand, wish to not have to load multiple pages to read the whole thread, so you change it to 40.
If you then link someone to domain.com/threads/1-this-is-thread/page2.html#post50 this link will work for you, because post number 50 is on page 2. However, anyone with the default posts per page setting will see their page 2 (which only contains posts 21-40) and will not see the post you're linking to.
If, on the other hand, you link someone to domain.com/post-50.html#post50, this will correctly load page 2 of the thread for you, and page 3 for everyone who runs the forum default setting, and snap to the correct post.
This is the desired functionality in DragonByte SEO, and as a result we will not be changing that link.
As a Pro customer, you can customise the "Show Post URL" to more closely resemble your old URL, if the new display bothers you. However, you must still use the two variables listed in the description.