Too much light/heat? The Amnesia Haze kind of looking a bit sad with the hanging Leafs and curled edges. It is the only lady of 11 that look like this.temp can be up to 30 deg c.
Amnesia Haze absolutely adores warm weather. I would say overwatering is likely your problem.
If you're indoors and they only sag right before lights out, that is completely normal and not a problem.