Anchoring columns does not always work correctly

Steps:

• Open Screen01.ui.qml file from the attached test project Loginui1
• Select fields component in Navigator
• Open Layout in property editor
• Anchor to top of tagLine with margin of 170
• Result as in attached picture
• In Live preview, position of the button column seems to be correct
• Switch to Edit mode and back to Design Mode -> anchor is not visible anymore in the properties view and position of the button column also changes in Form Editor.