"a bit confusing" is correct and usable in written English. You can use it when you want to express that something is slightly difficult to understand. For example, "The instructions for this assignment are a bit confusing.".
It is all a bit confusing.
That seems a bit confusing.
It was all a bit confusing.
Well, it can get a bit confusing.
But it was "also a bit confusing.
But it can get a bit confusing from there.
I always found the MGMT "sell" a bit confusing.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia