Rain drips down my fascia boards...

Recently purchased house has had guttering and fascia boards replaced by previous owner, and since there are no soffit boards I see that on two sides of the detached house they have put ~25mm thick spacers between the rafter ends and the fascia, thus moving the line of the guttering out from the tile edge.
Result is that you can see light if you look up between the guttering and the facia, and when it rains a significant amount of water runs down the facias, and the outside of the guttering...
Before I buy a set of ladders to get a closer look, can anyone suggest why the previous builder did this, - I mean they must have gone to some trouble to cut and mount the spacers, so assume that they were attempting to address another 'problem'
Any comments gratefully received!

Daylight should not be seen between gutter and fascia

He has not dressed felt into the gutter, or has not fitted proper eaves tray instead of the felt

That is why you are getting the staining - some water is missing the gutter

Thanks for the quick reply -I thought a picture might help

That fascia doesn't look new (?)

If the fascias were replaced by the previous owner how can you be sure that the spacers weren't there originally and there's always been water getting behind the gutter?

An eaves tray as suggested should help

I was told by a neighbour that they had been replaced at some time in the recent past....
and the fascias on the other two sides of the house don't have them.

Here is a picture looking up (out of upstairs window, nearly dropped the camera...) however the edge of the tiles only just reach the edge of the guttering.

Thanks for the advice guys, looks like I'll be getting some eave trays this weekend!
Cheers