Pace showing twice for each activity

Where exactly? Can you post a screenshot? If you speak about the list of activities, then you can adjust the visible columns at individual activity types, after clicking the settings symbol on the right side of the table header.

Thanks I can give an example. I have just recorded a walk using GPS on my Vivoactive 3 I then synced using Garmin connect web and when I select the walk in activities and I get the map and the route as expected, I then get a graphic for elevation, heart beat but recently (and if I flick back through existing activities) - pace comes up as a graphic twice underneath each other.  Yesterday I recorded an activity for cycling and that was all fine as elevation, speed and heartbeat displayed normally.  I havent included screen shot as Im not sure how to do it.  I am using an IMAC running Catalina and all was fine until recently when a few days ago the pace graphic started duplicating.

Ah, yes, you are right, I just checked my last Walk activity, and indeed the Pace graph shows up twice now (it did not before). Just wait for the next update, till Garmin learns about it and fixes it - it's just a bug on the website. There is nothing wrong on your side.

Thanks trux, Is there a simple way (perhaps via E mail) to inform Garmin about this or do they generally follow the postings on these forums anyway. Its not a big problem, more an irritation really. 

I do not think they monitor the forum closely. There are email addresses available for the developers of the mobile app (in Google Play store), and for the beta versions of firmware for individual devices, but I am not aware of one explicitely for the web app, so the best would be using one the standard support channels for your country (it varies from one land to another) - phone call center, email, twitter, ....

For me, it's Hiking activities, which I imagine are displayed very similarly to Walking. My activities are recorded with a copy of the Walk app that I've renamed to Hike, and then I reclassify them online. But this also happened with a GPX upload from another platform.

Your best bet is to go to support.garmin.com, choose Garmin Connect as the product, and then click Chat or Call. I started a chat yesterday for this very issue, but my internet dropped out, just after they asked me to see if it's happening on Connect Mobile. (It's really irritating to me that they expect users to volunteer their time when they're already suffering from time-consuming widespread Garmin software issues.)

I have sent an E mail to support with a detailed description of the problem as above and received back a request for photo's which I thought was a little strange as when I first contacted them they had already asked for permission to view my account which clearly displays the problem. Anyway I have now researched how to capture a screen shot and sent them a view of the problem page. I will update here when I get a response.

Im pleased to say that after several E mails back and forth with Garmin support this issue has today been resolved. Im not sure if they intervened and flagged this as we were still communicating about the exact problem. Either way I have now informed them that all is well.