(This is probably a reflection of telepathy-logger, but it's nonetheless a bug for Previous Conversations)

When a conversation goes idle for a threshold  amount of time, its log gets segmented. This works badly enough for ongoing chat conversations which idle just slightly longer than the threshold at a given time (thus not justifying the logical segmentation), but it's particularly bad for ongoing MUC conversations. My logs for a given day are flooded with several entries for every IRC channel I'm on. The various chunks aren't meaningful to me (I wasn't paying attention to the channels at the time let alone memorizing idle periods in the chatter).

I recommend merging all the chunks for each MUC conversation for the visible time period (or at least merging them per day).