Adjust target bitrate on exporting

Hi all,

Updated to latest Premiere Pro, and since then cannot 'fine tune' the target bitrate when exporting. 

Rolled back to previous version, and same thing. I assume one of my preferences has been changed, and searching for the answer has given me nada, so here I am.

Previously:

I could input a specific bitrate, say 1.2, or 3.65, etc etc

I could also use the slider that would increment in between whole numbers.

Now:

Slider goes 1, 2, 3, 4.... 18,19,20 etc

Manually entering a bitrate that isn't a whole number sees the bitrate jump to the nearest whole number.

How do I get it so I'm able to set the bitrate between whole numbers again?

Many thanks in advance.