After yet another discussion with the support have I tested to create a completely new file within Numbers and exported that as an Excel file which I then continued to edit on after reopened it. The spreadsheet originally only contained one column with dates and then I added some text in a few cells.
The bug was shown after adding some lines (two for example) and inserting information in the shown schema. The bug is present only when I have my external monitor connected.
If anyone likes to get the excel file to test the problem feel free to sent me a message.
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