Hey @Samuel828282, 
Thanks for your post and sorry to hear about the trouble with your achievement. Depending on the activity, it can take a while for all achievements and leaderboards to update. You can try to Change your activity to Canoe > Save > wait a minute and then go back and update the activity to the correct type to force any missing achievements or segments to rerun again. This typically resolves the issue for our athletes.

You can also try to Refresh Achievements on your Activity: More information
For segments, you can try to Refresh Segment Results: More Information

If you continue having problems, have performed the actions above, and have waited 24 hours, please submit a support ticket with a direct link to an example segment and activity where you are not seeing the PR. 

The links should look like this:
https://www.strava.com/activities/186108431
https://www.strava.com/segments/229781