401(A) Vesting Schedule 199%

I’ve been working hard on eliminating debt and starting to build retirement. As I plan for future contributions, I’m focusing on where to put my money. I currently have a 401(a) through my employer that states I’m 99% vested. According to the vesting schedule, I’ll be 199% vested at the three-year mark, which is coming up soon.

I’m somewhat new to this and can’t figure out what 199% vesting means. I can’t imagine that my account balance would double at the three-year mark, although that would be incredible. I will be checking with my employer, but I’m hoping for some insight here before I do that.