Eligibility is not checked again by the CPO. VO only does that. But there are other multiple tasks that has to be completed. For example, verifying IELTS, LOA, Financials, you educational documents and/or employment letters that are carried out by agents instead of VO. Based on the note, the CPO either reports back to VO with all the info or process ahead (again by the recommendations provided by VO). This can go on for a while. Again, these lengthy times are due to covid and the backlog, else this used to happen with in days instead of weeks/months.