Batch Sparge

I'm having trouble how to set the batch sparge info.  All I want to do is tell BS to take my total sparge volume and make it two steps.

I guess I could just do the math and divide the total volume by two.  But I thought there was a way to do that in BS so that it tells you that on the brew sheet.

Go to mash tab and check batch sparge and equal batches.  Do not check drain mash tun.

Ensure mash tun volume percentage is large enough to fit your pre boil volume in 2 sparge steps.

mark

It's not giving me two equal volumes though.  My total volume is 5.06 gallons.  The two sparge volumes it gives me is 1.35 and 3.71

I tell it to use equal sizes, drain before sparging and then adjust the percentage of the tun to fill until it gives me the desired number of sparges.