Frame Stuttering/Tearing (idk what it is)

PC is
Ryzen 5 3600
GTX 1070 OC Armor
16 GB DDR4
ROG STRIX b450-F

I have 3 dots next to my FPS counter sometimes when I play Overwatch. FPS usually is around 100 as I cap it there since my display doesn’t support anything higher.
The 3 dots was an error I had trouble fixing on another PC built with a ryzen CPU, as these dots sometimes cause what feels like input delay.
Any idea what’s up with that?