a chunk got changed(including biome)

i was playing and i logged of. when i logged back in my world a chunk changed into a different one. it out of nowhere became a desert hills biome and it wwas a desert hills biome when you look at it. please is there a way to fix this cause this is the 3th time this happend in my world.

if this is handy to know its in the spawn chunks 

here's a screenshot of it

i have commands in my world so if there's a command to change it pls tell me and give some instructions on haw to use it                      thank you if you tried or so