I don't know about 'normal'. But, to be sure that your pages display correctly in all browsers it would be best to have "no" errors. I went through all my pages one at a time(I had more errors than you have for sure). I started at the first error on each page and worked my way through. Sometimes one error corrected will fix several others. I am very slow so this took several days for my site and still not done. Good luck if you decide to do this.