Gadgets overlap after collapse and refresh

Issue Summary

The dashboard gadgets do not align correctly after a collapse or a refresh. To make them appear properly the gadgets need to be kept expanded and then hit a refresh
This is reproducible on Data Center: yes

Steps to Reproduce

1. Install and Setup Jira 9.x.x
2. Create a dashboard with a few gadgets
3. Collapse a gadget and observe that the gadget below does not align itself
4. Hit a refresh and observe a black space after the gadget that collapsed earlier
5. Now expand all the gadgets and hit a refresh to get a clear view
   Please watch the screen recording for a better view of the problem

• https://recordit.co/vOgFHK9a95

Expected Results

Gadgets to be aligned properly according to the space available

Actual Results

Gadgets do not align properly after the collapse or a browser refresh

Workaround

Expand all the gadgets and hit a refresh on the browser. All the gadgets will load correctly in their respective spaces.