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Should not have installed gutter flashing/drip edge over older - on a reroof they should have stripped down to bare sheathing - they got lazy, but other than premature rusting possibility due to old flashing, probably no damage done assuming the ice and water shield overlays the top surface of the flashing.

Putting the new gutter edge between fascia and old flashing is right, so any runoff drops into the gutter.

There are two thoughts on exposed fascia board - some like tucking the gutter edge tight up into the bottom of the flashing so no splash can hit the fascia board, others like me like the gutter as low as it can go while still having the gutter flashing drip into the gutter, so there is more room for visible icing and icicle formation before it fills the gutter unseen, and to expose the icicles to sunlight so they can melt through and break off at the shingle edge. Leaving some fascia showing also leaves it open to sun and breeze so it does not retain moisture in a confined area, so there should always be at least 1/2" or more gap at the top of the gutter edge.

Under normal conditions, unless you are subject to extremely heavy rains frequently, the amount of splash onthe fascia board should not be a problem.

As LCD wrote the roofer took a short cut not removing old flashing. This is common because they do not have to drop ie remove the gutters to install the flashing. ( In your case is just lazy installers) I would not allow bare fascia behind a gutter. We install a strip of aluminum behind a gutter if the roof aka gutter apron is too short. The best hanger is a hidden hanger with a screw, in an ideal world it would be driven into the tail of the rafters but it is almost never done. See my blog for gutter pitches required.

Jim Casper Gutter & Gutter Cover Conractor

ps If you intalled a gutter low on a 12/12 or greater roof pitch the water off the roof would hit and bounce over a gutter.

Source: www.heartlandmastershield.com

Here at DOVETAIL RAINGUTTER we have learned that the back of a K gutter (sometimes referred to as a "ogee ") should always be placed behind the metal drip edge. If the gutter is not behind the drip edge there is a chance that rain or melting snow may not fall from the edge of the drip edge, but instead cling to the metal and run behind the gutter. Other causes of the water running behind the gutter if properly installed are, roofing not extended 3/8" past drip edge, improper overlap of drip edge, ice and water membrane placed beneath drip edge. The bracket screws should not be screwed through the drip edge. Instead the drip edge is bent to allow the gutter to be placed behind it and the fasteners are below the drip edge. There can be exceptions depending on width and of roof edge flashing.

Source: www.dovetailraingutter.com