Hello there 
R0J0hound,
First of all, thank you for taking your time to try to solve this issue and give me a hand.
Now I have a few questions about the tilemap position. What do you mean exactly with "Oldposition"?
This is the event sheet I had in the first place. The objects which are pasted are HUD elements, players and other sprites. 'Scenario' and 'Background' are tileset and you can see they are positioned beside one another filling the viewport.
Something like this?
Sorry if I make some dumb questions but I barely know about Construct and programming.
Regards!