Commands didn't work on commandblocks.

Commamdblock is missing anything at the end if you use

Here is the problem "@p"

Last thing my Plugin List

That’s a Spigot issue. Spigot doesn’t fully support command blocks in 1.13. Their hacked way used in 1,12 and below broke completely with 1.13.

Yeah, I'm fairly sure you can't use the @p etc selectors with plugin commands.

Not much I can do about that ^^

Something to fix this ?

Nag the developers of Spigot to fix it. The issues is soley in Spigot/Bukkit.