Nitesh Gehlot The station values in your cross-sections are showing as "0, 0, 0, 0"; which are wrong.. The stations values are the distance from the bank line along the cross-section. So it starts with 0 at Left Bank and ends at a distance of right bank (width of the river)..
Also check the unit system in HEC-RAS main window.. Your cross-sections are generated with the distance of 0.03 m between them (river station ID shows the distance, so difference between two consecutive river station ID will be your reach length), and that's why the reach length is showing zero..
I would suggest you to refer the HEC-RAS tutorial videos from YouTube, or follow the step by step software guideline from the HEC-RAS manual..
Most likely a problem with your DEM (TIN) map. If you use a map with a lower resolution, the cross-sectional shape will be correct. For example, a DEM map less than 5 meters is suitable.