Is it normal for the Festavia curtain to only cover part of a door?

I've got two sets of these up in my house and went through the same head-scratching over the length. My take: the gap looks fine once the bottom edge lands on a natural line, and it looks like the lights just gave up when they stop mid-glass with nothing to anchor them. In my living room the strands end right about where the sill starts, so it reads as deliberate and nobody has ever commented on it. On the door at the old place there was no line to hit, they just stopped a couple of feet above the floor, and it bugged me every time I walked past. Layering a shorter string light set underneath is what I tried first, and I'd skip it. Curtain strands are evenly spaced vertical drops, string lights are a loose tangle, and next to each other the two textures clash badly. It ended up looking exactly like the patchwork effect you're worried about, just stacked instead of side by side.

What actually worked was hanging a second identical set below the first so they run top to bottom. Since you'd want a second set anyway to sort the width, think of it as one set for the top half and one for the bottom. The seam is visible if you go looking for it, but way less obvious than a mismatched strand would be. Two things to check before ordering: each set has its own plug, so you need an outlet or an extension run down low, and keep that cable off the floor where feet and pets go. Also take ten extra minutes matching the drop spacing of the lower set to the upper one, it makes the join much easier to unsee.

If you'd rather not spend again, my honest answer is that after a week or so of walking past it you stop noticing. It's only glaring in the first few days while you're comparing it to what you pictured.

Before I'd buy anything else I'd try just lowering the rail a bit. I had the same empty strip under mine and moving the hooks down a foot got the ends sitting just above the floor, reads as intentional. You lose some coverage at the top but with a door you barely miss it.

Course, back when we all ran icicle lights along the eaves nobody expected them to reach the ground, the drip was the whole look. Might be a case of adjusting the eye rather than the setup.

Not convinced lowering the rail works for a door the way it might for a window. You'd have strands hanging right in the swing path, and every time someone opens the patio door to let the dog out or step onto the deck they're walking through the lights. I tried somethig similar on ours and the bottom row got snagged constantly til I put everything back where it started. A window that nobody opens is a different story, but a functioning door needs the bottom half clear. The second set stacked below seems like the only fix that doesn't fight with how the door actually gets used.

Mine used to bug me too until I stuck a big planter under the bottom edge of the strands. The lights now fall into something instead of stopping in mid air, and the eye just reads the whole thing as one finished display. Cost me nothing because the pot was allready sitting there doing nothing. Works on a door as long as the plant sits off to the side where nobody swings it open. If you have got a pair of boots or a bench by the patio door anyway, try shifting things around before you spend another cent.

Same result on our end with something sitting under the strands. Mine hangs over a bookshelf by the window and the drops ending against the shelf edge just looks finished. One extra thing that helped: I moved the shelf a couple inches closer to the glass than I normally would, so the last row of lights actually grazes the top of it instead of hovering an inch short. That contact point is what sells it. If you go the planter route, get it close enugh to touch, a visible air gap between the last bulb and the object underneath reads almost as bad as no object at all.