CDO

Hi everyone,
I have downloaded a dataset of historical precipitation for South America. I used the following CDO code to process the data:

export path_merged=/mnt/data/historical_colombia/prec/merged

export path_prec1=/mnt/data/historical_colombia/prec/ccc-inpe

cdo mergetime ${path_prec1}/cc_pr_hist_1.nc ${path_prec1}/cc_pr_hist_2.nc ${path_prec1}/cc_pr_hist_3.nc ${path_prec1}/cc_pr_hist_4.nc  ${path_merged}/cc_hist_out.nc

export path_prec2=/mnt/data/historical_colombia/prec/mohc-inpe

cdo mergetime ${path_prec2}/mohc_pr_hist_1.nc ${path_prec2}/mohc_pr_hist_2.nc ${path_prec2}/mohc_pr_hist_3.nc ${path_prec2}/mohc_pr_hist_4.nc ${path_merged}/mohc_merged_out.nc

#------------ensemble mean

cdo ensmean ${path_merged}/cc_hist_out.nc ${path_merged}/mohc_merged_out.nc ${path_merged}/ensmean_hist.nc

#-------------------cut files

cdo sellonlatbox,-77,-75.5,3.3,3.8 ${path_merged}/ensmean_hist.nc ${path_merged}/ens_hist_cut.nc

#---------------from flux to mm

cdo mulc,86400 ${path_merged}/ens_hist_cut.nc ${path_merged}/hist_mm.nc

#----------------data(year,lat,lon)

cdo yearsum ${path_merged}/hist_mm.nc ${path_merged}/hist_y_l_l.nc

#----------------mean 1986-2005
cdo timmean ${path_merged}/hist_y_l_l.nc  ${path_merged}/ens_mean_final.nc*

Then when I plot the 'ens_mean_final' file (last one of the code), the precipitation is reversed, in high picks I have minimum precipitation and at the sea-level areas I have the maximum and that's not valid for the areas' climate.
I noticed that variables.keys of the file includes : dict_keys(['time', 'time_bnds', 'lon', 'lat', 'pr']), but there isn't something like rotated_pole, r_lon or r_lat as usual. I think here is the "error". Do you have any recommendations to solve this issue? I hope I was clear... I attached the ens_mean_final.nc file too.

Thank you!

P.s I noticed something perhaps relevant in the CDO User Guide, on pages 17-18.