Timeslips: slips are underlining themselves

Hi All -

I have a strange problem that started happening a few months ago.  When we type in our time and expense slips, they are not underlined.  But, when I print the pre-bills and bills, random entries are suddenly underlined.  I don't think it's a user issue, because it randomly occurs to slips, maybe 3 of 20 for a particular client, and slips entered by different people on different computers.  I can go back in and highlight the text to un-underline it, but the time it takes to do this is starting to wear on me.  

Any ideas on a fix? 

Thanks!

Heather