It doesn't look like a jade to me.

What mix at you using?

That's one very odd looking jade plant. Whatever it is its in dire need of more light/sun and a faster draining mix as that one looks very dark and peaty.

Gill

Did you put it right out into direct sun or did you slowly acclimate it? Asking because plants can sunburn the same way we can if they're just put right into sun. I can't tell from the photo if it's burned or if the spots are something else like edema/oedema (when the plants cells burst from taking in too much water) or a fungus.

ETA: it might be Crassula nudicaulis platyphylla or something similar rather than C. ovata. Hard to tell since it's etiolated as Gill mentioned.

I bought it as a Jade unless the nursery pulled a fast one on me!I have the purple trailing one thats doing awesome and flowering nicely. I kept it in the same soil I bought it in. Had it in shade when it was too hot but saw it wasnt happy then moved it to full sun. It looked happy for a few days and then started looking ill again. It gets full sun and in the morning and dappled sun in the afternoon. Ive checked the roots to see for rot too but they didnt seem rotten.

I think it's not what you are doing wrong but how the plant was grown before you brought it home. The new growth looks better and dark and it's probably getting rid of its old leaves that aren't in great shape. You thought it looked ok because that is what it was when you bought it but it had too little light and too much water. It will look very different in a few months

Rina, Im in Johannesburg South Africa and we currntly in end winter so humidity isnt high

Yes Nik, it was under a shde in the nursery so I dont think it got any sun.