Please help? Any insight on this chart is appreciated!

Micah

My temps are always so crazy, and I'm always thrown off by such a minimal ovulation dip. I had a DEFINITE clear as day positive opk cd17 and CD18, but clearly the dip on cd17 was less than in the beginning of my cycle. My temps are always low and never seem hit 98 or higher, but it's just strange how erratic they are at the beginning of the cycle, vs when I ovulate. Thoughts? 🤔