Inventory Slots Unusable

My laptop install of Minecraft has some inventory slots that I cannot use except for in a chest. The top row, last 3 slots can have stuff in them, but my mouse cannot select the items unless I am in a chest. I cannot shift-click those items either. I've tried reinstalling, but to no avail. I've taken the saved world and moved it to my desktop and the issue was not present on that computer. The type of item is irrelevant. The issue is also present in the creative inventory occasionally, but with only one slot.