Minecraft world generation differs using exact same seed

I looked on the forums and stumbled upon an interesting seed and decided to try it out. Firstly installed this on my server with the following details:

Seed: -7531061490504685328
Type: Large Biomes

At /tp -986 33 -2560 there should be a dungeon with a skeleton spawner. Instead, it was not there. I thought I would try it locally. Created a single player world on my laptop, with the exact same details, and at /tp -986 33 -2560 there was indeed a dungeon.

At this point, I closed my laptop, and decided to go on my main pc to check out the complete seed first before I place it on my server again.

I created a single player world on my PC with exactly the same details as my laptop. I did /tp -986 33 -2560 and there was no dungeon to be found!

Tried this back and forth on my laptop and pc and everytime the dungeon is there on my laptop, and not om my PC, it's driving me insane. For both PC and Laptop, exact the same:

[11:12:54 INFO]: Minecraft Launcher 1.6.11 (through bootstrap 5) started on windows...
[11:12:54 INFO]: Current time is Apr 4, 2015 11:12:54 AM
[11:12:54 INFO]: System.getProperty('os.name') == 'Windows 8.1'
[11:12:54 INFO]: System.getProperty('os.version') == '6.3'
[11:12:54 INFO]: System.getProperty('os.arch') == 'amd64'
[11:12:54 INFO]: System.getProperty('java.version') == '1.8.0_20'
[11:12:54 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[11:12:54 INFO]: System.getProperty('sun.arch.data.model') == '64'

Both PC and Laptop eventually running Minecraft 1.8.3. No mods, no texture packs, all clean installs, clean .minecraft folder. Same account, same java runtime details.

Eventually I want to run the version with the dungeon on my server, anyone have a clue how I can achieve this.

UPDATE

Adding a little bit more info:

server.properties

spawn-protection=16
max-tick-time=60000
generator-settings=
force-gamemode=false
allow-nether=true
gamemode=1
enable-query=false
player-idle-timeout=0
difficulty=1
spawn-monsters=true
op-permission-level=4
resource-pack-hash=
announce-player-achievements=true
pvp=true
snooper-enabled=true
level-type=LARGEBIOMES
hardcore=false
enable-command-block=false
max-players=20
network-compression-threshold=256
max-world-size=29999984
server-port=25565
server-ip=
spawn-npcs=true
allow-flight=false
level-name=world
view-distance=10
resource-pack=
spawn-animals=true
white-list=true
generate-structures=true
online-mode=true
max-build-height=256
level-seed=-7531061490504685328
use-native-transport=true
motd=A Minecraft Server
enable-rcon=false

Screenshot of the world with dungeon:

enter image description here

Screenshot of the world without dungeon:

enter image description here

Link to the forum post, so maybe you can try it out yourself.

minecraft-java-edition

Pictures about "Minecraft world generation differs using exact same seed"

Minecraft world generation differs using exact same seed - Multiracial positive male and female students using smartphones in city park

Minecraft world generation differs using exact same seed - Smiling young woman in casual clothes showing smartphone to interested senior grandfather in formal shirt and eyeglasses while sitting at table near laptop

Minecraft world generation differs using exact same seed - Focused male student in casual wear and glasses browsing smartphone while sitting at wooden table with stacked old books

Can the same Minecraft seed be different?

Seeds are somewhat compatible across editions, with terrain generation and biomes being the same. However, structure locations still remain different between Java Edition and Bedrock Edition.

Do old seeds work on new versions of Minecraft?

Old seeds will still work when creating a new world after this update but will look very different, taking advantage of the new world generation features and changing the player spawn position.

How do seeds work in world generation?

Minecraft world seeds are generated by entering a string of characters (including negative or positive integers) into the "World seed" box within the Minecraft menu. As few as one character can be used, and each number will generate a unique world.

Is each Minecraft world different?

Minecraft's universe is procedurally generated, meaning that an algorithm places each asset\u2014every hill, mountain, cave, river, sheep, and so on\u2014in a unique arrangement every time a new game is loaded, so that no two players' worlds are exactly alike.

History of Minecraft World Generation - Generating the same world in (almost) every version

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Sarah Chai, Keira Burton, Andrea Piacquadio, Andrea Piacquadio