MHRV Pipes disturbed & Minor Efflorescence

Hi folks I was up in the attic changing an mhrv filter on my brink renovent 400 mhrv system. I noticed that a number of the pipes had disconnected. 1 from the unit to exhaust outside, the other, mhrv feed for air in to a manifold and another to a manifold. Any idea why or how this would happen ? It’s been unreal windy for a while, I’m wondering has the sheer force of window come down the intake and extract and just moved the pipes ?

Also spotted some efflorescence in both chimneys. Don’t see or feel damp but see a lot of efflorescence. The leads from attic side seem good on both and I have a lined steel chimney in for the stove in one only. Concrete and Groundworks is my game, not this. But I have read that the lined chimney can cause vapours to build between clay and steel and sometimes cause moisture. The other chimney is not in use and has never been, house 5 years old. Small bit of efflorescence on it 3 blocks inside attic no further. That’s in a room that’s not finished and air from house circulates up it. I’m wondering is this just moisture from rain etc causing this issue ? And the fact the chimneys might literally have the liner only no cowel.