Item bar display error

I am a Chinese player in middle school,My English is not very good,So I may not understand what I'm saying.
This is a problem found in the 20w21a version.I submitted two screenshots.I don't express it very well, so I suggest looking at the screenshot first.When I check the properties of the items in my backpack, I find that the quantity of other items is displayed on the properties of the items I am looking at.
Hope to fix this bug.
It's hard for you to read these incoherent words