1) why is LILAW & LIZFW same in this scenario what it means?
The index value depends on the trim datum chosen for the trimsheet and the loading entries. While it would help, greatly, to know the aircraft Type and Model, the reason will be related to fuel arm(s) and quantities between ZFW and LW. Essentially an artefact of the sheet's design.
2) How is LITOW so much FWD?
Impossible to assess without the sheet. This is due to the fact that constant CG lines on the index envelope are sloping .. ie, without the sheet, one cannot necessarily infer what is happening with fuel (or loaded aircraft) arms. It is NOT necessarily valid to infer a more forward CG solely on the basis of the IU value.
3) is LI described in '%' like CG or just 'units'?
Index, depending on the definition, will either be dimensionless (ie just a number without any units) or (less likely) moment units (eg kg.mm), Index will NEVER be in length units, such as CG is.