Wheel Hub oil seal - still leaking

Afternoon all.
Recently changed both rear wheel hub oil seals. All went on ok.
Have noticed that on one of the wheels there is still a drop of transmission oil on the wheel. Only on one , not the other.
Wagon has been still for about a week.
Did spin it up and take it for a spin after changing seals , no sign of leaking at that stage.
Leak is very small , just visible.

Question is , do I need to be concerned about it , or is a Series 3 feature ?

cheers all.

What was the condition of the stub axle carrier Land like? When I did the front axle on mine they were pitted an being a later model I had to replace the whole stub carrier. The concern is if it is leaking from standstill, might be worse when running and get on brakes. There's something wrong somewhere.

Edit: 2nd thoughts... Is the oil on inside or outside if wheel. Outside might indicate a simple felt washer failing.