Apps running in background - I didn’t download

Hi

I’ve noticed that my screen time sporadically goes up. For example, I had one app running for 23 hours in the background.

What is really concerning is that the apps are usually ones I haven’t downloaded and am only able to stop them by putting a limit on them.

Today, an app ‘Bloomberg.com’ is running. I can’t even find this on the App Store. I’ve put a limit to stop it.

I’ve downloaded security software to scan my phone but this isn’t all that good for my concerns. I’ve change my password regularly.

Any ideas what is going on?