Helo,
I don't know who to trust from these 3 web sites that generate the map:
1.  https://rustmaps.com/map/3500_82415557
2.  https://just-wiped.net/rust-maps/procedural-map-3500-82415557
3.  http://playrust.io/map/?Procedural%20Map_3500_82415557

... you may notice that map number 1 is different from map number 2 and 3. All three maps are 3500 in size and have seed 82415557.
Who to trust and this maps problems has anything to do with the new Rust update?

I have noticed that this is a problem with almost all maps when I generate them through these websites.

I have always used the map seeds from the RustIO server page http://playrust.io/
I have a look after the wipe (server off)  and pick one the size i want that is procedural  (live) and enter the seed into my customcommandline manager file , i have never had any problems and all the monuments are there , i use the recommended map size 4500 so the map is not too crowded with monuments as i use a bot plugin which populates the monuments,

It is likely that the map on rustmaps is different because it is up to date with the current update. Last month facepunch changed the map generation which means that maps will generate differently from before.

I wanted to hear this answer. So because of the news monuments the seed of the maps is not the same as before. That's how I understood it now.
In any case, I have to believe rustmaps.com (if I am wrong I ask someone to correct me).

It's a common issue after big Facepunch updates. Many map generators take time to sync with the new procedural generation logic. This is why it's safer to check the server's actual live data. On Rust Server List, we try to aggregate the most accurate wipe and map info directly from the servers to avoid this confusion. Always worth cross-checking there before committing to a seed!