Issue Summary

Using Safari web browser, you can't edit any numeric field in the backlog view, It seems to be a problem with the front-end code or CSS style. 
The same behaviour is also observed when editing the time estimate fields like "Original estimate" directly from the issue using the Safari browser.

Steps to Reproduce

1. Go to the backlog view
2. select any issue and try to edit the Story points or any numeric field in the right panel. 
3. The box component is hidden or disabled safari_error.mp4

Expected Results

You should able to edit the Story points.

Actual Results

The input component gets hidden unable to edit the value.

...

Workaround

Use another web browser

Open the issue in a new tab.