From the pics it looks like your TV is not switching to RGB mode correctly with the signal coming from the Amiga. Sometimes on modern flatscreen TV's there is a menu system that lets you select which kind of signal the Scart sockets on it should expect (ie: Composote, S Video, RGB)....
It could also be that the voltage on the Blanking (Scart Pin 16) and AV Select (Scart Pin8 ) pins and could either be missing or not being interpreted correctly by the TV...
The cable you bought should have have a connection going to scart pin 16 and this needs > 1 to 3V applied to it for the Blanking Signal otherwise the TV will be trying to display a composite picture...
Pin 8 for the AV/Select should also have +12V on it, to display the Amigas picture correctly in 4:3 Apect ration if your TV is a widescreen version.
Do you have the Brand and Model number of the TV your using...
See here for pinouts Amiga to Scart
http://pinouts.ru/VideoCables/AmigaScart_pinout.shtmlI would think the Cable you bought from AmigaKit should be fully wired but you never know, if you can open the SCART hood and check to see if there are connections made to pins 16 & 8 as if there aren't the TV won't switch to RGB mode and you can end up up with a mixed signal like you seem to have...