Are the fork seals rubber?
If so make sure you use proper red rubber grease.
Ordinary HMP grease with attack rubber and cause it to swell and cease to seal.
I had a rubber bush on my VFR swell by at least 25% because the previous owner greased it.
There are a lot of greases out there for specific purposes.
So if I put HMP grease on something it swells in size.
The Mrs says 'thanks for that !'