Term Store missing complete list of terms

In my Term Store Management Tool, when I expand a Term Set, it is not listing all terms.   It used to list the complete list of terms, but just recently it doesn't .  The down arrow is missing where you would click to see the rest of the terms.  It only lists the first 10 terms. 

Anyone know how to fix this to be able to see the complete list of terms?

I know they are still there, as I can see all the terms when I upload a document (metadata choices).

thanks!