Codelite version 9.2.2
Kernel: 4.4.0-34-generic x86_64 (64 bit) Desktop: Cinnamon 3.0.7, Distro: Linux Mint 18 Sarah

Scenario:
A.this is c++ code line one
this is c++ code line two.B

1. Select both lines use mouse, select "Edit-Comment-Comment Line". Result: both lines will be commented out.
2. Use mouse cursor to select both lines. Specifically, click from letter A, hold and drag mouse to highlight to letter B. Select "Edit-Comment-Comment Line". Result: both lines will be added one more "//" in front. Expected: the two lines of code are un-commented.

However, if in step 2 we do "click from letter B, hold and drag highlight to letter A" (different highlight direction). Select "Edit-Comment-Comment Line". Result: both lines are correctly un-commented.

This actually happens to single line of code as well.