mine was doing it for awhile, until I realised what was happening
now when I lower the roof, I add more weight to the road side (lean more) when I put it down
hit and a miss if I get it spot on, but its somewhere near enough
I also had Mr Havachat from Australia Wide Annexes come to my place for measure & quote
took longer, as SWMBO offered him a coffee.................... about 2.5hrs
and the same when he delivered it, and put it up to show me where everything went
20 mins to fit annex - 2 hours of chat & coffee