A mouse over hover effect has become standard in most major software UIs. This effect allows users to interact with controls in a more intuitive way and gives users confidence that they are making the selection that they intend. However there is a long standing NI bug that renders the hover effect inconsistent (see the discussion here: https://forums.ni.com/t5/LabVIEW/Button-Boolean-mouse-hover-not-working-on-64-Bit-LabVIEW/m-p/3944252#M1121887)
Until NI makes a fix one 'solution' that I will employ is to disable the hover effect with the controls that I am using so that users do not get confused by a control stuck in a hover state.