In your case, based on the GCMS extract you have sent your eligibility is met, however, the officer seems to have concerns with the number of years of work experience you have claimed on your form. This could be because of various reasons. You may have gap years, or part time work experience. Or you may have changed jobs, with gaps. Sometimes, the IRCC officer wants to verify the company you have worked for or existence of the company. Usually this happens when the companies merge and a new company is formed, and the agents cannot figure how can you work at a company for 5 years when it was incorporated 3 years ago. To avoid this, your reference letter should be clear.
But I do not see any problems. If you reference letters were clear, and with the agent's note, which states that your eligibility is met, you will be fine. Usually the RPRF is asked after the eligibility is met. So as soon as it is confirmed, you will receive the letter asking your for the RPRF payment.
As regards the due date, it has no relevance. It has to be marked so the agents mark it, however, it has no significance on your file. Some files are marked 6 months in the future, but are processed much faster. I would not worry much about it.
Hope this helps!