Scheduled Stop Charge works but then car starts charging again

I currently have my car set to start charging at 00:30 (when my cheap overnight tariff starts) but it often won’t have finished charging by the time the cheap tariff finishes (04:30) so I am using a Teslafi Schedule to stop charging at 04:30 (my work cycle means I can happily top up on consecutive nights if I don’t quite hit my charge limit within one nightly 4 hour window). This seems to work initially but then the car starts up charging again some time later (this morning for example it stated up again at 06:30 and continued to it hit my charge limit). Is there some setting I am missing or something I can do in scheduling to prevent the car restarting the charge after Teslafi has stopped it?