missing singles entries

It is medsingl.glo. I may have found the problem. I had the minimum number of letters for words set at 6 which would explain why Cipro didn't stay. I was able to enter it and could find it when I needed it as long as it was the same day that I entered. However, I have been noticing some other words that I was sure I had entered that are no longer there. I have changed the minimum letters and will keep an eye on it.