When placing down and quickly switching hotbar slots, the highlighted hotbar slot will change, but in your player's hand you see the block that you were previously holding. If you try to place down a block it will place down the block you were previously holding as well.
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Thank you for your report!
We're actually already tracking this issue at MCPE-69865, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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This Glitch Can Also Happen In The Inventory And Can Cause You To Duplicate Any Armor Piece (I Found This Out When Quickly Switching Between A Chestplate And Elytra) And Remove The Other Armor Piece