Hi Ellen34
with all of the above.
One of my semps is flowering and doing much the same that yours is, leaning over like that. With mine in particular, it's just leaning towards the light. I keep them on my patio in summer and have been moving things around and just plunked some of them into a spot that only gets bright shade but no real sunlight whatsoever while I rearrange things. Just put it in a brighter spot (but not full sun yet!) and it should perk up soon enough.
You could separate and repot them if you want but it's not necessary. The natural growth habit of these plants is to grow mashed against and tumbling over each other, crowding doesn't faze them. If it's really hot in your area yanking them up could stress them quite a bit as well, but if you really want to, go for it but try to disturb the roots as little as possible. Once the weather cools off some it would be a much better time to repot them! In the meantime they will be perfectly fine.
