I'll be happy to help answer your query. As AMWSmith suggested it is most likely suggestions that's turned on and making the recordings for you. This feature can be turned off by following these steps:
HOME > HELP & SETTINGS > SETTINGS > RECORDINGS > SUGGESTIONS > ON/OFF.
Also it may be worth checking your Series Links to see what's setup. If there's any setup then you can cancel them here also. Follow:
HOME > MY SHOWS AND RECORDINGS > MANAGE MY SERIES LINKS > SELECT PROGRAMME YOU WANT TO DELETE > CANCEL SERIES LINK
I hope this helps, let me know how you get on, I'm here to help.
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