Bizarre stadium relocation in Norway

I've just won promotion to the Adeccoligaen in Norway with Lyn FK, the successor club of Lyn Oslo who played at Bislett Stadion.

My "new" ground is being upgraded with undersoil heating and have been moved to the Voldslokka Stadion for 9 months, having researched it looks abandoned.

How come I've been moved here and not back to Bislett, where the club played before?

my only suggestion is that the creators of FM dont know that the ground is abandoned. when i was playing as hinckley united they moved to middlefield lane temporarily (the old ground) which is now a housing estate.