Layouts Blocks Moving Problems

I have a very strange problem. I am editing a layout. When I move any block it doesn't stay behind my mouse but somewhere in the distance. The problem occurs if I am not at the top of the page (if the page is scrolled). The more the scroll the more the shift. See the screenshot where I highlighted where my mouse is and where the block is while I drag and drop it. However, the block moves to my mouse position, not where it appears.

The second question about numbers Grid # (span #), that are located below each grid block. What is the difference between them? When I change the width of a grid the Grid # changes correctly and shows the number of columns, but the span # doesn't. See again my screenshot, where the Grid is 3, the span is 6.

The version is the last one 4.7.3.

layouts.jpg

Update.

I more or less understood about spans and grids values thanks to this post: http://forum.cs-cart.com/topic/36564-trying-to-understand-grids-and-spans-v415/

But the main problem still exist. I found that it also exist in http://demo.cs-cart.com. So either it is a bug or my computer problem. I tried Chrome, Firefox, IE and Opera and check on 2 different computers. This bug is everywhere.

Also noticed another one bug on this page, think they are connected. Sometimes the page is auto scrolled after I open a block settings (gear icon). Can live with it but a little annoying.

Update.

I more or less understood about spans and grids values thanks to this post: http://forum.cs-cart.com/topic/36564-trying-to-understand-grids-and-spans-v415/

But the main problem still exist. I found that it also exist in http://demo.cs-cart.com. So either it is a bug or my computer problem. I tried Chrome, Firefox, IE and Opera and check on 2 different computers. This bug is everywhere.

Also noticed another one bug on this page, think they are connected. Sometimes the page is auto scrolled after I open a block settings (gear icon). Can live with it but a little annoying.

Hello,

Perhaps you have a virus / anti-virus on your computer? Anti-viruses are known to change the contents of websites and ungzip pages before the browser gets them.

Kind regards,