Row total wrong in Matrix report

Anonymous , Is is a count distinct measure. Or a measure uses IF, isfiltered etc. In a measure, a grand total is recalculated. So there can few reasons around it. Share you measure formula

Are you using a distinct count? 

If yes, what that image tells me is that you have a total of 422 DISTINCT Sales Order Numbers in the table. Some of those numbers (about 30 from the numbers in your image) might be listed twice, so are Partial and also Full. 

If that doesn't help or make sense, can you please elaborate on where the FULL/PARTIAL information comes from and if it is in the same table or related table to the Sales Order Number?

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This looks like a measure totals problem. Very common. See my post about it here: https://community.powerbi.com/t5/DAX-Commands-and-Tips/Dealing-with-Measure-Totals/td-p/63376

Also, this Quick Measure, Measure Totals, The Final Word should get you what you need:
https://community.powerbi.com/t5/Quick-Measures-Gallery/Measure-Totals-The-Final-Word/m-p/547907