FPS alternating from 59 to 60 ?

[KonTap]

Hey

Lately I notice some 'odd' behaviour with the FPS counter in the game. (the one you can see in the corner of system configuration)
For example when I go into Garuda extreme during the fight when I run around with things going on I notice the FPS most of times being on 59 but sometimes it jumps to 60 and back to 59 in a sec. When I run in one of the new SB towns it stays on 59.

Now I find this odd cause 1: With a lot going on in the screen, i would actually expect the fps to drop down instead jumping up? 2: My system would be more then able to keep the game stable I think.

My specs:
I7 7700 4.20 ghz
MSI GTX 1080
16 GB RAM
m.2 SSD 500GB (game installed)
m2. SSD 250GB ( Windows 10 pro)
BenQ monitor is put on 60hz 1920x1080 (120 is available)

In the control panel of nivdia I did change only one thing and that is setting the power option to maximal performance. I run the game on max settings. I can vaguely remember I noticed this behaviour before and then it was gone for months. I hardly have any background stuff running except MSI afterburner.

Anyone any ideas what this behaviour is? The jumping.. can it be stabilized? Sometimes I think it could be an issue with new nvidia drivers in combination with new windows updates or settings or the game. Anyone?