Ok, that's probably two separate bugs. I have a 100% reproducible scenario in 
Firefox, even with a single monitor, on an up to date, freshly booted 17.04:
1. Go to https://yoast.com/research/autocompletetype.php
2. Don't input anything and press Submit your name. An extended form appears, 
with fields for name, email, and more
3. Start typing your name in the name field. The autocomplete menu pops up and 
shows several alternatives (assuming you have some autocomplete values 
registered). Do not select anything, but instead keep typing random letters 
until there is no autocomplete match and the autocomplete menu disappears.
4. Go to the email field, and type the first letter of your email (assuming 
your email is registered as an autocomplete value)

Result: the autocomplete menu appears, but it is anchored to the name
field, not the email field. Moreover, it is out of sync with the mouse
position (it behaves as it it was at the correct position, therefore the
highlighted item does not match the mouse position).

If in step 3 you choose an autocomplete entry instead of typing random
stuff and having the menu disappear, the problem does not occur.

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https://bugs.launchpad.net/bugs/1641629

Title:
  Autocomplete popups are misplaced

Status in Ubuntu GNOME:
  New
Status in firefox package in Ubuntu:
  New
Status in gdm package in Ubuntu:
  New

Bug description:
  Since Ubuntu 16.10, Firefox misplaces autocomplete popups. In the
  attached screenshot, the autocomplete popup is displayed below the
  "Nombre transferencia" field, although the focused field is "Mensaje
  para destinatario", below. Also, moving the mouse pointer below the
  correct field actually highlights completion options as if the menu
  was there (see the mouse pointer position on the screenshot)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: firefox 49.0.2+build2-0ubuntu0.16.10.2
  ProcVersionSignature: Ubuntu 4.8.0-27.29-generic 4.8.1
  Uname: Linux 4.8.0-27-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  gpothier   3169 F.... pulseaudio
   /dev/snd/controlC0:  gpothier   3169 F.... pulseaudio
  BuildID: 20161025164528
  Channel: Unavailable
  CurrentDesktop: GNOME
  Date: Mon Nov 14 11:57:19 2016
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions:
   English (South Africa) Language Pack - langpack-en...@firefox.mozilla.org
   English (GB) Language Pack - langpack-en...@firefox.mozilla.org
   Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
  InstallationDate: Installed on 2015-01-23 (660 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
  MostRecentCrashID: bp-604f3b87-472e-4026-8588-3d2122160725
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=49.0.2/20161025164528 (In use)
  RelatedPackageVersions:
   google-talkplugin 5.41.0.0-1
   rhythmbox-mozilla 3.4.1-1ubuntu1
   gnome-shell       3.20.4-0ubuntu2
  RunningIncompatibleAddons: True
  SourcePackage: firefox
  SubmittedCrashIDs:
   bp-604f3b87-472e-4026-8588-3d2122160725
   bp-1cd058b7-bfd2-4105-a9b4-1852d2160703
   bp-b5b0d8b4-2b5b-40f5-b468-f5eec2160122
   bp-aba8367f-3da0-4f1c-9342-b377f2151224
  UpgradeStatus: Upgraded to yakkety on 2016-10-30 (15 days ago)
  dmi.bios.date: 03/30/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 76CN43WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Yoga2
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058STD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Yoga 2 Pro
  dmi.modalias: 
dmi:bvnLENOVO:bvr76CN43WW:bd03/30/2015:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoYoga2Pro:
  dmi.product.name: 20266
  dmi.product.version: Lenovo Yoga 2 Pro
  dmi.sys.vendor: LENOVO

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