whenever i press the fn ctrl ålt shift or cmd key it shows on my desktop

(Im not sure if this goes here, but im desperate)

So I got an iMac for christmas and im having a problem,

whenever i press the fn ctrl ålt shift or cmd key a picture of it will show up on my dekstop



and when there there on the screen its like im holding down the button, it has the same function. for example, if the ctrl icon is on the screen and i left click, it right clicks it for me

how can i stop this because its really annoying

Have u had a look in System Preferences/Universal Access/Keyboard in case a function has been set to on?

thank you!
it had sticky keys on from when i pressed shift 5 times earlier,
thanks!