What percentage of copied content is acceptable?

My website is showing a few pages (7 out of 50 posts) with around 6% copied content. I am worried about those content since my intention was not to copy any content from the internet.

My post has an average of around 1700 words. What to do in that case?

All tools will show that some of the content is copied. If you have written it yourself ( or some part is just copied and rewritten/ or exactly copied but you added reference ) I think there is nothing to worry about

Dont copy even 1 para.

Zero