If you have multiple items in your inventory and if you open the inventory, a chest etc and select an item you will see the Lore but the quantity of the items will go over the Lore and it will be bugged.
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We're tracking this issue in MCPE-181338, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Fixed. Please check the Fix Version/s field in that ticket to see in which version this behavior was or will be fixed.
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It says it was fixed in version 1.21.20 and this happens in 1.21.21, will it be fixed in the next version that comes out?