Items are not properly moving in inventory.

Ok so I was playing minecraft pc version and when I activated the keep inventory cheat on I went to my home and I couldn't properly move items in my inventory. I deleted the world and went to my other world. Then I notice the samething. I couldn't properly move items in my inventory. For example, If I click I could move it around but I have to click and drag the items. I also couldn't shift click items properly. I deleted minecraft.exe and reistalled it and the samething happened.

I was expecting for the items to properly move and function but I think its broken.

To activate the bug I think you have to have keep inventory on.

I will also provide video footage on what is happening in the attachment.
In this video you can hear me clicking on the items.