cant place or break blocks at a point

[ChadolateMilk]

https://user-images.githubusercontent.com/91827797/135750104-c21fb22a-98a1-440e-b19d-45f1e9605173.mp4 this person cant break the blocks or place them even though its not the end of the island limit

island name is /is spawn qwuzx

(sorry for the music in the video i forgot i was listening to it)

[ghost]

Cords for cobblestone block get counted as outside island limit as /is info errors, island doesn't follow exact 200x200 as it shows on info cmd