Are you using an USB microSD card reader? Either way, the mounts on RetroPie are managed by usbmount, not by Kodi itself.

im not sure on the version i dont know how to find out. but ya it still works in my pie 2
the image and instructions i used where from the petrock i think and it was a new sd card.
i did hget a sd card with noobs on it already when i got the pi3 and i started it up tht that and instaled rasbian but that shouldnt matter if i take that card out and put my retropie card in right

@chorlton2080 You didn't as you provided none of the requested information in the post - but with your attitude, you are unlikely to find any help here (or last very long on this forum).

@Lyle_JP nope, it's a LCD TV. And it occasionally shows menu items that are completely unrelated to the current system being emulated. Occasionally there are other menu glitches when exiting games (menu scaled or zoomed to only fit system name on screen for one). I could try scanning my SD card for error I guess?

Overclocking will give you more stability on games that may currently be "borderline" for you.

https://github.com/retropie/retropie-setup/wiki/Overclocking
EDIT: Sorry about previous post. That was better advice for a Pi 1. Use the settings for pi2. They're good and safe.