Hi @fstat.
After I removed additional CSS I put and found it was caused by my own mistakes. Thank you so much for answering me here.
However I’ve replaced the theme with some other premium themes for hush reasons(the Featured Post set section gone, it maintained the same status even all plugins deactivated and had it reinstalled to make sure it could be still good to stay with), but I do really love the theme.
Special thanks to the theme developer, and supposed you’re one of them. ??