Hi community members 
A quick update on this case:
There is recently an issue filed at our GitHub repository (link to the post)
We would recommend that all of you can provide some more data and information such as:
- logs
- screenshots
- iOS version
- browser name+version
- browser network data as .HAR file if possible
as overall it seems like Grafana UI does not work well with iPhone.
Your feedback on this issue will be useful for Engineers to improve the quality !! 
Lastly, please subscribe to the above issue to get up-to-date news on the fix or a possible workaround.
Thank you 