Help: old expert advisor still working while autotrader is OFF


My old EA is being executed even when the autotrader button is in "OFF" mode. This is a problem because I dont want to execute trades during certain times of the day and I am using also using a new EA. Therefore, the old EA is no longer needed. 

Is there any way I can delete any history of the old EA so that this doesn't reoccur? 

Thanks in advance for your help.