I am using Odoo 16 with a custom QWeb PDF report for purchase.order.

When the report has multiple pages, the vertical borders of the line items table overlap the header table on page 2.

It looks like wkhtmltopdf redraws the vertical lines incorrectly when the page breaks.

What happens

• Page 1 renders correctly

• On page 2:

  • thead repeats correctly

  • But vertical borders from the line table extend upward and overlap the header table above it

    Paperformat

    
        PO A4 Format
        
        A4
        Portrait
        45
        70
        7
        7
        
        37
        90
    
    

  Report declaration

Template Structure

What I already tried

• border-collapse: collapse

• Removing border-left/right

• Using border: 1px solid #000

• page-break-inside: avoid

• Removing @page CSS

• Using only one main table

Issue still happens only on page 2+.