I ended up on the ground too
The tails on their rope are cut very short to the knots. The knot ended up coming untied. I had my original Amsteel from the WBBB (changed to Whoppies) so I swapped out the nylon. What was a "bouncy" soft sit became very firm upon changeout of the suspension.
I'm 6'4" and 275 LBS. A tight fit for me, but I use it in the front yard to nap or for the kids to play in when we have our monthly weekend block parties on the Cul-de-Sac.