Sunburn from direct sun

What's happening

Adansonii grew up under the dappled shade of the forest canopy, and its thin leaves aren't built for harsh, direct sun. When strong rays hit the leaves through a window, they scorch the tissue, leaving dry, faded, brown-to-bleached patches that don't recover — usually worst on the leaves nearest the glass.

How to fix it

Move the plant back from the window or to a spot with bright, indirect light, or filter the harsh sun with a sheer curtain. The scorched patches won't turn green again, so trim badly damaged leaves at the vine if you want a tidier look; the plant will replace them with healthy growth once it's out of the direct sun.

This is general guidance based on common symptoms; individual plants vary.