Just finally fixed the rear freehub of my birdy and started riding. It's great, but the bike front wheel obviously pulls to the right.

The bike is an early version in mostly good nick, been stored for a while by previous owner, so front and rear fork/frame looks like they are in good condition and have some life in them yet.

I heard the bike can get unstable at speed, but been riding slowly around my street. The wheel even moves to the right when holding the bike still.

What could be causing this? Is this common?

Thanks