Malware on smartphone, not getting picked up on scan

Avast Mobile Security keeps saying my phone is fine however, my internet app will open to a website every few days without me touching it. And given, this isn’t even the browser I use or have set to my default, it makes me worried. Is there any way I can get help with this without having to pay the subscription? I mean, if I have it, likely others will as well.

Please share some screenshots of the websites in question, thanks.