Pinned area sometime disappear and reappear.

[Sahadporn]

URL: https://covid-tracker-ske17.herokuapp.com/country/

When you pin some country it sometimes change, appear, and disappear.

I've tried these following scenarios:

1. I pinned Austria.
   

2. I clicked on the pinned Austria. The web does redirect you to Austria again but the Austria on the pinned bar disappeared.
   

3. Now, I search for Bolivia the Austria that I pinned still didn't appear.
   

4. I pinned Bolivia. Both Austria and Bolivia reappear in the pinned bar.
   

5. I clicked on Bolivia on the pinned tab it's disappeared just like Austria. Then I search for Bulgaria, the pinned tab reappear as Afghanistan and Cameroon.
   
   

6. I clicked the delete pin button for Cameroon. The page refreshed and Austria, Bolivia come back.
   

7. Now, I clicked delete Bolivia it's disappeared. But when I clicked on Austria both Bolivia that I deleted also come back.
   

[lisbono2001]

This may occurred because caching of web-browser and the server, we're trying to figure it out.
If you have any idea feel free to leave it there, Thanks for you response🙏.