the quality of the screenshot is pouring... with yellow color
Looks to me the way it was set up from the original design. Now the out focus Fuzzy type I could see as being a defect with either Camtasia or SnagIt. With Macs using Retina Displays and the video cards they use the display should be Tack sharp. But nothing from SnagIt or Camtasia ever is.
Along that vein, you first may want to go into System Prefs > Display to see if the appropriate profile is in use. I have occasionally run into situations where a new software install caused the profile selection to be changed resulting in odd display problems. Probably worth checking.