When drawing the sea temperature gradient map with the data of Himawari-8, why the image is mirrored?

Question

When the data of Sunflower No. 8 is used, the image obtained is mirrored： enter image description here

And the result should be like this： enter image description here

In addition, the area on the map does not correspond to the entered longitude and latitude, below is the code to get the latitude and longitude area I need

clc
clear all
load('20210130_daily_sst.mat');%,[1,1,1],[inf,inf,1]));
load('grid.mat', 'lon')
load('grid.mat', 'lat')
lon=lon(1,:);lat=lat(:,1);

lon1=find(lon==118);
lon2=find(lon==130);
lat1=find(lat==24);
lat2=find(lat==42);


lx=lon(lon1:lon2);
ly=lat(lat1:lat2);
[x,y]=meshgrid(lx,ly);
x=x'; y=y';
sst0= SST(lon1:lon2,lat2:lat1);

But these problems will not occur when using MODIS data.