Mmm, it seems right when I tried it. Are you able to recreate that?
The standard grab chance is 20%.
I started a second save. For short I thought I was stupid. But it happens after going outside one time and then back again.
I tried it with the next upraged.. Aaaand now I completly confused.. It happens from 2* to 3* too? And instead of 24.. 16 too? Did not noticed that by playing. But after restard it looks normal again.
And thanks for the info. ^^