End of round point total miscalculation

So, sorry if this has been asked and answered, but my tablet makes searching the forums nearly impossible, and EA's customer service is about as useful as tits on a bull (eat a whole bag of *, Live Chat). 

There's, consistently, anywhere from a 10-30 point shortage in points earned (or lost) and what my math tells me my totals should be round to round. Is this a known bug, is there a workaround, or is EA's attitude "Too bad, so sad" and I should learn to live with it? 

I'm just wondering if there's some other way point totals are calculated that I'm unaware of where a minus 13 round actually equals a minus 24. As an example, I started my session tonight with 290 total point score. Lost a few rounds, and my point total by subtracting the points I lost each round should have been 242. Instead it's 213, which is an considerable difference. What am I missing? Thanks to anyone who can help. 

For edification, my platform is PS4.