Could be a GTK related problem, either within LCL or your GTK version. It could even be a theme error. I suggest you first change your theme to a stable one if not already and see what happens.
Thank you for your reply, my system is Linux Mint 18.2 MATE 64-Bit, I have not changed the theme, I just changed the size of the system font.
I copied the compiled program to the XUbuntu LiveCD virtual machine, the same problem.
I will install Linux Mint 18.2 MATE 64-Bit and Other Linux in VirtualBox, and then test it again.