Velux balcony window VEB won’t shut. Frame too far away.

[Davejohnson78]

Opened lower window on a velux balcony (VEB lower GEL upper). It now won’t shut. It is tight on the bottom sill but the main issue is that the left hand edge of the frame where the locking mechanism bolts lock into are now too far away. It is too far away for bolts to engage. So will just swing open if top window isn’t shut.
Was working fine when bottom last opened about 6 weeks ago. Everything still measures as level with spirit level.
What has caused this??
I attach some photos. Going to contact velux tomorrow but grateful for any thoughts.

Thanks

 

[noseall]

Perhaps a lack of solid packing around the latching zone or hinge side coupled with the warner weather..?

Is it possible to expose the jamb by carefully removing some of the tile hanging from the top down? I doubt easing the hinge side over (bottom hinge packing perhaps..?) would be any easier, looking at it.