Debbie, when you tagged this "Website", does that refer to the CDE Software website (cdesoftware.com) or to League Secretary (leaguesecretary.com)?
If it's the latter, I just looked up my own history (on leaguesecretary.com). I missed three times, and for two I got a substitute bowler. In both of those cases, the week number didn't appear in my listing. In one, though, I did not get a substitute due to it being unforeseen, and the team used my absentee score (in the case of this league, my average less 10 pins) and those printed in red.
I didn't notice anything in bold/black on the history, just black only, for actual scores bowled. I checked a few other league members and didn't see anything bold there, either.
Specifically, where exactly are you looking at to view histories? You need not supply a URL link, just describe which buttons you clicked on to arrive at someone's bowler history.
TeamCDE Volunteer
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Always check, download, and install the most recent update of your software to ensure that issues may have been corrected.