Pivot Table Decimal Number Is Not Showing Under Ajax, this can be reproduced in both Desktop WebView mode and under Full Browser mode:
Pivot table under desktop or IEplugin:
Same table under Ajax or WebView Mode:
The situation related to the document properties for the chart has come to a state which is not handled.
From developer side it is possible to get to this state, e.g by first design the table as a straight table, then select MiniChart representation for the expression, then convert the chart to a Pivot table.
But the efforts for fixing this is too big for extra value add in the product, above workaround can be applied. The issue is not a downgrade issue and will not correct in coming QV12 version either.
Open .qvw file, right click on the Pivot table ->Properties-> Expressions->Display Options, set the Representation to "Text"