CPC Islamabad sent a letter to my parents asking them to submit the application form(IMM 0008), current police certificate, proof of relationship to sponsor in canada and copies of passport once again for Principal applicant and all the dependents. They had submitted all these docs even the originals 2.5 years back when they initially sent in there application. Why are they asking for these docs again now? Are they going to start the processing all over again???

This is normal. Do fill up the forms again.if any updates required you can do it now. I happened to me