It gets extremely irritating to only download on my pc. I always miss out on freeleech torrents whenever I'm away from home. ( Yes , I browse torrents even if I'm outside lmao ).

So the question is .... Am I allowed to download torrents on my phone and pc using the same account with different downloader ( Qbit is not available on Android ) without getting banned or anything?

You can download (login and register) from multiple locations - however, the issue becomes whether others are downloading on that same IP (which is what can trigger multiple-account warnings)

Personally, I use a set of VMs in the cloud ($5/mo!) as well as a VPN connection from there to do my downloading!