My Quote Line items are up to 21; not displayed all, and there is no horizontal scroll bar


I have migrate my suitecrm ver 7.12 to 8.12
my customized line item js ported to the new version.
None of my 21 line items are visible, and there is no horizontal scroll.
only visible with 50% of the browser zoomed out.

What options are there for handling the situation?

Please advise ,

fred kh