Maybe I am missing something but I am currently sitting at 296 points on fateful showdown, and I thought all rewards were in increments of 5. Did I miss something here?
Its some sort of display bug. Happened to me too but if you go into your coalition and look at event scores that way, it shows the correct amount.
There is a known bug in PVE events where you are randomly rewarded extra point in your own score but its only cosmetic bug as it doesnt add to coalition total score
And I wrote known bug because D3 admitted to reading forums to find bugs etc
soo hello Will 
Hi losdamianos 
(I’ll double check that our QA team is aware of this)