Outage history on certain nodes showing only current day

Hello,
We have DUDE 3.6
It has been working fine, however we recently added a new network map, and all of the nodes in the new network map will only show “outages” for today.

It does not show any outages prior to the current day.

Any ideas on what i have done that would cause previous outages to “drop off” or be erased/lost?

Thanks
Sean