Glitches in PDF when printing tables

When printing checklists (at least with Portrait, 4 columns) containing tables in the Label 2 field, sometimes strange glitches are created in the PDF files: The heading of the table is repeated again either below or over the table. This appears to happen especially if there is a block of items each containing a table happens to be split over two pages:

This can be reproduced with my checklist “TABLE GLITCH”, printing the list in “Landscape, 4 columns” will produce the glitch in the last table of the section “Flugleistung ISA”.
When changing the print properties of the section “Verschmutzte Zündkerzen” to “keep together”, all sections containing tables are printed on the last page, and no glitch appears.