Hi @MariusBaard
Analyzed the part file you provided and I could reproduce the issue with simplified part file. It appears, for this type of bend, the bend line position - Center is causing some issues. While this problem will further be drilled down, here are some quick workarounds -
1) If bend relief is not required - Either turn off the checkbox on dialog or extend the bend line on both sides.
2) If bend relief is required - Use separate bend lines for creating two bends or set bend line position to Start.
Please refer to the video attached, simplified part file & your part file with workaround applied, for detailed information. Hope it helps.