Sorting mixes row numbers

Steps to reproduce:

• Create a project
• Import attached test_data.json in Model Editor view
• Right click on top of isActive column and select "Sort Ascending"
• -> row numbers get mixed. I would expect sorting not to effect row number.
• Select some row in the middle and click add row above / below
• ->Row is not added above or below the selected row, but somewhere else. Row numbers change again.