That seems to happen as they age. The bottom leaves fall down and act to prop up the plant. Nothing to worry about.

Now, if you have rot in the center of the plant I've seen similar symptoms - but followed by the upper leaves within a short time. Tug gently on the center leaves- if they come out, the plant is toast. If they don't, your probably fine.

The plant looks quite healthy. If as suggested, gently tugging the leaves doesn't loosen them then all will be okay. As the plant becomes larger you'll have to expect some of the older leaves to droop. It can also happen with some mechanical damage, like something brushing up against them.

thanks. i will try tugging on the center leaves and see what happens and post again later as an update :)