The models of the sign are not aligned with the hitbox of the sign, this is a small bug, but Minecraft has been working on fixing hitboxes of certain models such as Iron bars, redstone, stairs, etc.
The actual model of a sign, when placed on a wall, is lower than it's hitbox, the hitbox should be changed to match the model of the sign.
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We're tracking this issue in MC-148581, so this ticket is being resolved and linked as a duplicate.
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Hello there! This looks to be a duplicate of MC-148581.