Perhaps the answer can be found in the Android settings for apps? An active option, for example, “Allow notifications for updates blah …” could be the reason. These settings let Android apps run in the background.
You should generally avoid Apkpure. Why?
https://apkpure.com/privacy-policy.html
Apkpure’s aggressive methods and data collection contradict Sailfish’s security philosophy and privacy. I’ve been wondering why Jolla has offered Apkpure for years. F-Droid is the better alternative if you are looking for Android apps. Clean, OSS and ad-free.
A question that everyone should ask themselves: Why do I use the “secure” Sailfish when I install any advertising and tracker-contaminated Android app? Android’s poor group security model helps with this.
If that’s what you want, you can stick with Android.
My 2 cent