The slots should be:
from 0.00 to 0.55 (the max value is excluded)
from 0.55 to 1.10
0.55 will match the slot 2.
if you want to make 0.55 match the first slot you can change it to:
from 0.00 to 0.54 (the max value is excluded)
from 0.54 to 1.10