I think it's the strangest bug I have ever seen.
It's all started when I started working on an 1.13 map. So I just wanted to make sign that teleport you to somewhere and did a mistake. So as I saw that nothing did happan I checked the command block to understand what hppaned and I see this error messege-

[21:15:52] ...ft:sign 1 0 {BlockEntityTag:{Text1:"{\"text\":\"teleportetion\",\"clickEvent\":{\"action\":\"run_command\",\"value\":\"tp @p 152 52 -305\"}}",Text2:"

{\"text\":\"abcdefg\",\"obfuscated\":true}

"},display:{Name:sign}}<--[HERE]

What was my mistake, I can not understand, can you fix this?

I also upload a text picture to show what is missing