Mistaken /locate command locations

I'm not sure if its a bug or what but when I use the /locate command to find a monument at -300 ~ 100 it tells me it's at -1856 ~ 1120 which it is but when I look on amidst there is one at -408 ~ 664 which in-game there is even when I do /locate monument over top of the monument it tells me the closest one is 713 blocks away. Also just noticed that there isn't a single guardian spawning the elder guardians are there but no normal guardians are spawning or have spawned. and I do have mob spawning on. any suggestions?
Snapshot 20w21a
Seed: 70739393512612852