The best way to report bugs / suggestions for Colnect is using this forum. This forum is public and so you'll be able to see what other collectors reported and not repeat them.
PLEASE FOLLOW THESE GUIDELINES:
1/ Search this forum before posting, especially Pending issues for Colnect V2. What you're thinking about might have already been raised.
2/ Always include links to pages on Colnect. It makes it a lot easier to understand.
3/ Start a new topic for anything you wish to report. Please include a meaningful subject.
4/ Do NOT report wrong information on Colnect's catalog here. Use the "Add a Comment" feature and our editors will address your comment when possible.