What do you mean by rounding up two places?
Rounding up so that the precision of the number is expressed by, at the most, two numbers followed by one or more zeros.
In the specific case of 4.64 then the value of 4.6 is too low to prevent the overlap so in order to have a monotonic series the next value has to be rounded up to 4.7. To leave it at 4.6 would be to round it down.