Hello @elczkc 

Thanks for posting about this.  I don't believe anything has changed so I'm not sure why that's happening.  I'm going to escalate this post to Strava Support so someone can take a look and work with you directly to resolve.  Someone will be in touch soon.

This post has been escalated to our Support team. If you have a similar question please submit a support ticket and we will investigate further.

Thanks. Can provide details/screenshots if required. What's really odd is that the mobile app shows the correct 10k time (but wrong 5k) whereas the web portal shows wrong times for all distances including 10k...