Steps for replication:
1) In the rich-text mode, add a heading, by selecting the format type from the drop down.
2) Press enter, and notice that the heading is still selected, as compared to FireFox where it changes to "Paragraph"
3) Create a table from the tool bar
4) Populate with some data and switch to the wiki-markup mode
5) Notice that the table is lost, the content is still present.
The wiki-markup is:

h2. test

h2. 1212

instead of

h2. test

|| 1 || 2\\ ||
| 1\\ | 2\\ |

As a workaround, please ensure the format is selected as "Paragraph" before inserting the table.