So I don't properly know how to explain this bug. Or whatever it is. But I was mining said because I needed to get rid of the mound to make a animal farm but when I tried to move or collect sand in this specific spot in my inventory the sand would not move ot read 63 and I was confused as to why haven't anymore sand made it go to 64 instead but nothing happened. I have two videos here the first one is me moving all the sand to each spot in my inventory to make sure the next piece goes into the 63. And the next one is me trying to move it or some onto the 63.

https://1drv.ms/v/s!Apa-7Xt3uaFQfw2RWgPIkLVHcsQ

https://1drv.ms/v/s!Apa-7Xt3uaFQgQBD7aOUbgfbYOyu