Copying text from an MS Word document is a convenient way to move your text to a Blackboard text input box, but it can also cause very serious problems. While it looks like you're just copying text, the copy will bring with it lots of formatting code, which may produce unexpected results.
Whenever you want to copy text from Word to a Blackboard text box, use the Paste from Word tool:

5. Next, paste your Word text in the Paste from Word window and Submit.