Beersmith mobile question?

[DildoShwagon]

Hello I have a question about the fly sparging amounts uses in beersmith mobile. Well see I am just starting to understand beersmith mobile but I am little confused about the amount use for fly sparging here a picture of what I am talking about https://imgur.com/a/LALbLUf see in the picture it say to sparge with 10.53qt now  doesn?t that seem low for a sparging amounts?

[BeerSmith]

The sparge water is calculated as what's needed to meet your preboil volume - specifically:
  sparge_vol = boil_vol + grain_absorb - kettle_top_up + mash_tun_deadspace - mash_vol;

 where:
  boil_vol is the target pre boil volume
  grain_absorb is the volume absorbed by the grain during the mash
  mash_vol is the total volume of water added during the mash
  mash_tun_deadspace is the deadspace value (from the equipment profile)
  kettle_top_up is the top up water (from equip profile) added to the kettle pre-boil

--
Brad