[JIRAALIGN-1260] Opening a new epic on the backlog , nests inside another epic slide out

Issue Summary

When on the backlog, when clicking between epics, they nest within each other which shouldn't happen. 

Steps to Reproduce

1. Go to epic backlog
2. Click an epic to open it's slide out
3. Click into a child feature
4. Close the child feature
5. With the epic slide out still open, click another epic from the backlog
6. The new epic nests within the original epic slide out

Expected Results

Should close the original epic slide out and render a the new epic as its own slide out

Actual Results

The new epic nests inside the previous one

Workaround

Close the first epic before opening another.