The plant looks stressed for sure and guessing by the way the shoots are growing straight up from the top of the plant (and not from the sides or interior), I'm assuming an artificial light source right above the plant that is not sufficient for long term growth.
I agree with the above comment from
@Gdy2000 . Your Portulacaria afra is showing signs of too little light and too much water.
Though they look similar to jade plants (Crassula sp.) they are unrelated. They are an arid plains/desert succulent, and can actually survive a broad range of conditions, from desert sun and heat to light frost. One thing they will not survive is too much water - their roots are particularly sensitive to wet soil and will rot easily.
I have these all over my back yard - in hanging baskets as well as some larger pre-bonsai. They thrive in full sun, but can also do well in partial sun. They are actually more sun tolerant than jade - which at my latitude does not tolerate summer sun well. I water only when they are almost bone dry.
By the way... it is actually an edible plant. In South Africa they serve it in salads