I have a chlorophyll raster with WGS 1984 coordinate system and I reprojected it to UTM Zone 51 N using **[Project Raster](http://desktop.arcgis.com/en/arcmap/10.3/tools/data-management-toolbox/project-raster.htm)** tool and the nearest-neighbor interpolation option in ArcGIS 10.1. 

The reprojected raster values changed (WGS1984: 0-58.7058 while the UTM Zone 51 N (reproject): 0-40.9507) after the procedure (see image below). What should I do? Is that really will happen after? The `chl_reproject` layer is the reprojected raster (UTM Zone 51N) from the original having a coordinate system of WGS 1984 (shown beneath `chl_reproject`).

[![enter image description here](https://i.stack.imgur.com/mIMLf.png)](https://i.stack.imgur.com/mIMLf.png)