Looking at the inner primary pic it appears to be wet on the left of the casing and more concentration of wetness to the top then spreading out as it runs down.
Looks like the top fastener was leaking and running out of the hole in the casing for the fastener and running down to the seal.
Little tip on seals (you may already know) a seal can work as a cutting abrasive in time,..when dirt and grit becomes imbedded in to the rubber of the seal it can cut a groove in the steel that when a new seal is installed and set in the same place the new seal could leak because it's sitting in the groove made by the old seal.
To avoid the chance of that happening it's good practice to install a new seal slightly in or out but not in the exact same location as the old one was then the lip of the new seal is resting on a new unworn part of a shaft.
In the case of the primary seal it requires the seal be seated home (in as far as it can go) this puts the lip of the new seal back on that groove the old seal made. If you've already installed a new seal and it's bedded in as far as it will go for the price of a new seal I'd remove it and install one being sure not to bottom it out. It only has to be just a fraction off from were the old seal lip was riding on the shaft, in this case riding on a bearing race.
Then you'll have peace of mind that it's not going to leak from that seal,...(as long as the seals not damaged on installing the casing).
It doesn't heart to put a bit of sealer around the outer body edge of the seal when installing as well.