TOC issues

I’ve used Edit -> Copy special -> Copy document as TOC to create my table of contents.

After I’m compiling, here’s how I see it in the PDF preview:

I have no idea why the number of dots are not aligned and it looks terribly unprofessional. How can I compile an auto-generated TOC?
I don’t want a manually created TOC as I’m releasing my book, correcting stuff and releasing a new edition and I’d like to solve it in a professional way (via the program that should know how to do it).