Commands, NPC, structure blocks start reapeting start line texts in end line texts

Command blocks, npc's and structure blocks start repeating the first line in front of the next lines Example: /execute at @e[type=cow] run /particle Minecraft:knockback_roar_particle ~~~ when I open the command again this happen: /execute at @e[type=cow] run /particle Minecraft:knockback_roar_particle ~~~ /exec /exec /exec And this in all commands including npc's and structure blocks, please fix this