That is so weird. Did you input the ECA code and date of report?
The only other option I can think of is the case where you worked one year in Canada, sometimes that counts as 1 year postgraduate education. Then, getting ECA for 1-year PG education is not going to add extra points.
Try the CRS calculator with and without your ECA.
xxx.cic.gc.ca/english/immigrate/skilled/crs-tool.asp
replace xxx with www