Your plant is a Senecio scaposus. I have some questions:

1. How long have you had it?

2. When you repotted how did the roots look?

3. What type of mix is it in?

4. How much are you watering?

I had it for about a month. It looked quite healthy (I think) when I first got it, so when I first repot it, I kind of move it as a lump with the previous mix without inspecting too much. Then adding some commercial succulent mix sold in my area. I am not sure how to translate over the exact name of the mix.
So far I probably have water it 2 times then I did went away on a 10 days vacation. When I returned it was already quite sad looking (compared to my other plants) and I water it once more.
When I water, I water it until the water overflows and stop once the water starts draining out from the bottom hole.
I have plucked a few limbs that looks abit rotten but the main stem looks fine.
The picture is taken right after repotting
Thank you in advance

My suspicion is that it is stressed from potentially thing, a change in the watering regime. This plant appears to be sensitive to stress, and will show it easily. Where you bought it, if it was a nursery it probably got watered daily or every 2 days changing to every week and then a 10 day vacation would be a whopper of a change. Compared to your echiveras, this plant is a drama queen, treat it as normal and it should recover on its own.

Aand it’s starting to rot again. Taken this photo just this morning. It seems to be rotting from the middle. You are right Rob. I’ve never had such drama with my any other plant