Older pitchers will naturally bend over..happens all the time..
even in the wild..
mine often bend over due to the weight of the bugs they contain..
and yes, wind is a big factor..often the wind will bend over a pitcher, and it doesnt have the strength to bend itself upright again..I tie up quite a few pitchers every summer to bamboo supports.
assuming light is good, bending is natural.
Yeah my guess is indeed wind, for tall growing Sarracenia like Flava and leucophylla especially, My S. Flava has 4 or 5 pitchers that that have bent because of wind, brand new, newly opened pitchers, and some are not even opened, we have had some pretty strange weather over the last week
Even without a breath of wind, pitchers will eventually lean as new growth on the rhizome pushes over older pitchers.