The Assignments tool adds an extra zero to the point value of assignments under a certain condition.
To recreate (must have at least one group defined):
In assignments, click add.
Fill randomly till 'Grade Scale': choose 'Points'
Enter a value (I used 100)
Scroll down to Access.
Choose 'Display to selected groups'.
Now, "forget to choose a group" (leaving only 'Display to selected groups' radio button checked)
Scroll down and Click "Add Attachments"
You see, "Alert: You need to choose at least one group."
Also, a ZERO has been added to the end of the point value. If you entered 100, it now says 1000.