The default selection for the radioButtons with ID input$seats_ballots is "Seats". When the checkboxInput with ID input$percentage is triggered, an observeEvent changes the choices argument using updateRadioButtons. When 'updateRadioButtons is invoked, it resets the selection to the default "Seats".
The desired behaviour is keep the selected radio button when the checkbox is triggered. This will likely require saving the state of the selected radio button as a reactive.
The default selection for the
radioButtonswith IDinput$seats_ballotsis "Seats". When thecheckboxInputwith IDinput$percentageis triggered, anobserveEventchanges thechoicesargument usingupdateRadioButtons. When'updateRadioButtonsis invoked, it resets the selection to the default "Seats".The desired behaviour is keep the selected radio button when the checkbox is triggered. This will likely require saving the state of the selected radio button as a reactive.