Sounds like the bank format isn't printer friendly that's why it print s the way it does so unless less they give you option to print friendly from their site that's how it will look.

Is the list on a regular web page, or is it a PDF (similar to how monthly statements are presented)?

If it's a web page, can you see the problem already in the preview image, before actually sending the document to your printer or Save as PDF?

If it's a PDF, can you save it and print it from Adobe Acrobat or another dedicated PDF reader (not a browser)?