MC Sprinting Stops When hitting an Entity!

So every time I hit something like an entity or a player or a mob or something apart from blocks my sprint stops it makes it hard for PVP because it doesn't happen to others like my friends! This is happening on all versions I also go on! I have even tried Reinstalling Minecraft but it doesn't work! I don't play mods either! I have Also tried looking it up and it says it's been fixed but not for me!