iPhone Screen Time keeps showing I'm using apps I don't even have 
I'm trying to reduce my phone usage so setting myself lower and lower limits but these apps (Reddit & netmums chat) keep being included in my usage when I don't even have them, so yesterday I searched for them to be certain they weren't on my phone, they're not, and also set a 1 minute limit with a block and password to extend, I've just checked my usage now and they're both showing as having been used for 11 minutes each, both during the same hours. So the limit and block hasn't worked on them AND I HAVENT USED THEM 
What's going on?
Anyone else having the same trouble?
I've googled it and one page said I must have definitely been using them 