When the difficulty is set to easy, players attacked by mobs will take 50% the normal damage, plus 1 damage (half a heart). Since silverfish only do 1 damage, this means their attack gets cut to 0.5 damage, then the extra 1 damage is added and they end up doing 1.5 damage (three quarters of a heart).
MC-101615
Silverfish do more damage to players on easy difficulty than on normal difficulty
Resolved
Fixed
1
Confirmed
Minecraft 1.9.2, Minecraft 16w14a, Minecraft 16w15a, Minecraft 16w15b, Minecraft 1.9.3 Pre-Release 1, Minecraft 1.9.3 Pre-Release 2, Minecraft 1.9.3 Pre-Release 3, Minecraft 1.10.2, Minecraft 16w32a, Minecraft 16w32b
Minecraft 16w38a
Retrieved
Did a generic solution: if damage adapted to difficulty easy is higher than original damage, reset damage to original damage.