I have a handful of devices that seem bound and determined to connect through one particular other device for no reason that's obvious to me. I have a bunch of remotes scattered through the house (mostly on the second floor), all of which want to connect to a device in the basement, and only that device (I've pulled and replaced batteries in the remotes, but the device in the basement is hardwired). The remotes are in rooms with many other devices to which they could choose to connect, and pass many others still (including the hub itself) on their way to the device in the basement ... wondering if anyone can shed some light on this behavior and what might make the devices preferential like this. It isn't causing any issues (I have plenty of those), it just has me wondering.
I have yet to hear any logical explanation for how zwave devices route. But you can try to force some routes by...
Temporarily Disable the device in the basement.
Exclude, Reset, and Include the remote device. This will clear the Routing Table that is stored in the remote device. Turn it on and let it run for a few days. Use the remote device to force it to find available routes.
Then turn the basement device back on.
We've all experienced (those of us silly enough to look, anyway) wierd Z-Wave routing that seemingly makes no sense. My general rules of thumb around this:
- Only look at routing when I notice I have problems
- Don't worry about/try to change weird routing unless I have problems
Problems = slow or non-responding devices.
TL;DR - If it ain't broke, don't fix it. 
If you're having issues w/slow responses from a device w/weird routing, @dean's suggested steps should help your device to re-route. Note that if the device in the basement is also providing primary routing for other devices, removing it will also require them to find a new route, which might be sub-optimal for them. Over time they may return to the basement device. The one you don't want to use the basement may also return to it as well... 
Like I said, just a curiosity .. I have other issues that are actually troubling (you're on that thread too). I think what I find interesting here is the fact that they are limiting themselves to one neighbor, and at that, a single neighbor that can in no-way trump the signal from repeaters that are in some cases less than 24 inches away (unless the gain on the basement device is off-the-charts).
It's not so much that they all decided to pick a seemingly imperfect neighbors .. its that fact that they all chose the same one that makes me wonder.
I've seen that as well...several devices picking the "wrong" repeater, while a wonderful repeater (sometimes multiple wonderful repeaters) sit idle in perfect position to provide a lift. Given up trying to figure it out, and I've never seen anyone here who had a great explanation for it.
The routing algorithm is the best kept secret at SiLabs. I suspect there are many other factors that are involved that the Mesh Details app cannot show.
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