So, I've had this Chocolate Mint plant for about a month now and some/most of the stems are brown. Some leaves on this plant also have brown spots on them, but not all are affected! So my question is: does my mint plant have a disease, too much sunshine, or something else?? Thanks in advance!! ![enter image description here](https://i.stack.imgur.com/lGY8G.jpg)![enter image description here](https://i.stack.imgur.com/B6TPC.jpg)![enter image description here](https://i.stack.imgur.com/dag29.jpg)

Edit: Here are the bottom of the leaves!! ![enter image description here](https://i.stack.imgur.com/pYj0P.jpg) ![enter image description here](https://i.stack.imgur.com/bl9uL.jpg)![enter image description here](https://i.stack.imgur.com/R44RB.jpg)