Phrases Asking for Clarification

I'm not quite following.

Meaning

I don't fully understand what you're saying.

Translation language

John: So, the algorithm recalibrates based on user input.
Alice: <b>I'm not quite following</b>. Can you explain that again?
John: It adjusts its parameters in response to user actions.
Alice: Okay, but I still think <b>I'm not quite following</b> the exact mechanism.