At the bottom of support which is connected to fundament nodes, the y-coordinate = 0.2-0.5 m. (Depending on the tube size)
But the Auto-Flanger thinks the y-coordinate = 0
which causes some flanges to be placed wrongly.
To solve the problem, I temporarily use free nodes instead of fundament nodes. I think swapping the free nodes is much easier than fixing the flanges.
I couldn't find anything bout this in the previous topics, so I just wanted to mention the fact.