Disable my VPN? Why?

Why is it that I am not able to use my cell carriers android app, or my banks online-banking app (both running the most current versions from the Google Play Store) unless I have first turned off my Bitdefender VPN? Once I'm in those apps, I go right back to turn my on my VPN to complete my necessary transactions that need attention. That's why I need a VPN in the first place, right?! How do I get through this??? Thank you. Currently using a HMD Global Nokia X100 5G (2022) mobile device.

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