Please go through this link
https://www.ontario.ca/page/oinp-representatives
If you filled the application along with Representative consent as "No", then that shouldn't be a problem. Again, there should not be any indication or information that you're appointing a representative in your file if the file is submitted from your account.
If you filled the application along with Representative consent as "Yes" and submitted from your account, then the application might be delayed or deemed incomplete.
If others in this group have appointed representative, they might explain better.