The certification page measures data from the last three months and, as such, may fluctuate from day to day. For example, on 12 July 2018 the page will pull data from 12 April - 12 July 2018 only; on 13 July it will pull data from 13 April - 13 July, and so on. So, while you may be logging more DOPS, the percentages on your certification page may go down as the period being assessed changes.
You can view a breakdown of these figures by going to ePortfolio > Review my portfolio and clicking the 'Create summary pdf' tab. From here you can select the date range and procedure type you want to measure and generate a PDF document with data from that period.