The Jasmine is in a large pot!
The pot may be too large, thereby giving it too much water. Containers should be large enough to contain the rootball, and when repotting, just go up one or two pot sizes. Here are more growing tips you can check against your plant's health:
https://www.gardeningknowhow.com/ornamental/flowers/jasmine/growing-italian-jasmine-shrubs.htm