SPI Clock

Hi Dialog,
I have designed a custom PCB based on DA14682 that includes some other devices like an SD Card and etc. When I configure one pin as an output and toggle that in high frequency (like SPI Clock or Timer output), the created signal overshoots and when this pin is SPI clock, SD Card doesn't work normally. Is there anyway to solve this problem?
- I have tested some other GPIOs for SPI clock and all of them have this problem.
- The SPI clock tested on 24, 12, 8, 6.85, 4, 2 and 1.14 MHz (both PLL96 and 16MHz Xtal).