Swap items Glitch

Dear Mojang,

I'm already playing Minecraft for a while and I have a glitch with online servers but its also in a private world, if I swap items with my keyboard quickly then sometimes its gonna glitch. This is if I right-click with the item and then switch. What I can get are two things: 1, The item goes back where I begin from like if I go from a grass block to a sword I will go back to a grass block this will happen in like a half-second. 2, I will go to the item that I want to go but I'm still holding the block what I had before so I'm my Hotbar it looks like that I hold a sword and in my hand, I see grass block. Sorry for my bad English but I hope you understand it anyway.

Thanks for reading my Bug report and have a nice day,

regards, Onzin Stuiver