I believe the application erases the cache of official themes to avoid possible errors, because when you install a theme using chmm2, the function that allows you to install 10 themes gets damaged. It is to correct this you have to delete the cache gives store of themes.
If you use CHMM2's shuffle mode, and try to use the function of installing more than one theme gives theme store, when you add a theme it appears in the third position, leaving the first two empty fields.
The CHMM2 shuffle mode corrupts the theme store shuffle file.