Both Word and Google Docs preserve source formatting aggressively. That means bullets, tabs, headings, line breaks, spacing, and copied styles can all show up in the document.
Use Remove Formatting from Text first. Then use Remove Bullet Points from Text or Remove Line Breaks if the text still looks wrong.
If the source was Word or the destination is Word, also use Fix Copy Paste from Word. For Google Docs, use Clean Text for Google Docs.
Remove copied formatting first, then fix bullets, line breaks, and spacing before pasting the cleaned text into Word.
Convert the text to a cleaner plain-text version, keep useful paragraph breaks, and paste once into Google Docs.
Documents often preserve source formatting, so copied bullets, tabs, line breaks, and hidden styles show up immediately.