Steps to replicate

1. Install Confluence 5.8.13
2. Create a word file as below:

   Testing
   Line break 1 Line break 1 Line break 1 Line break 1 Line break 1 Line break 1 Line break 1 Line break 1 Line break 1 Line break 1 Line break 1 Line break Line break 1 Line break 1 Line break 1 Line break 1 Line break 1 Line break 1
   
   Line break 2 Line break 2 Line break 2 Line break 2 Line break 2 Line break Line break 2 Line break 2 Line break 2 Line break 2 Line break 2 Line break 2
   
   Line break 2 Line break 2 Line break 2 Line break 2 Line break 2 Line break Line break 2 Line break 2 Line break 2 Line break 2 Line break 2 Line break 2
   

3. Import the wordfile into confluence page

Observed behaviour

Expected behaviour
The paragraph should not converts to line break.