Preview PDF from Print command in web browser

I have this issue in both Safari and Firefox. I am on a webpage and use CMD P and then I open the PDF drop down menu in the bottom right of the screen and select "Open PDF in Preview". When I examine the bottom of the Preview document in FIREFOX and then scroll down to the top of page two I am finding that I am missing 3-4 lines of the original webpage. I can not tell you how many pages of PDF documents I have saved before finding that I was missing the 3-4 lines of data.

In Safari if I do the same steps I find that the break is exact and there is not any loss of the webpage. I am not able to adjust the size of the Preview document to keep the break from occurring in the middle of a line of text.

Does anyone have these problems with these two web browsers?

Are you able to change the break point in the Preview document?

Thanks

Andy