Well if you read this excellent post on the Youview community
you will see there are a variety of optons to try an address odd behaviour with your Youview box.
There is also a thread on this community about a recent issue with failed recordings.
https://community.bt.com/t5/YouView-from-BT/Failed-Recording/td-p/1838724/page/14
posts 135 and other posts by the BT Tv Expert are worth reading.
In your circumstances I would be be inclined to delete all the scheduled future recordings that you have visible in your future schedule recordings list AND do a maintenance mode type 4 ( keeping recordings) reset.