My MK2i shows safety stop at 115ft?

Hello,

I am experiencing a strange problem with my MK2i. When ascending to my safety stop depth of 15ft,  the computer is showing a stop depth of 115ft. It has been doing this consistently ever since after a deep dive I went into deco (very small burden) and blew my deco stop.

I have attached an imagine for reference.

Thanks!

-- Mike