We have found such issues during the export of Excel reports to PDF using FlexCel:
1) PDF converter can't process correctly a numeric value, if the format of containing cell is set to Fraction. After FlexCel update to version 5.7, the issue still present.
(Workaround: if you need to present some decimal value as a simple fraction, it's necessary to convert it to string explicitly; the cell format must be STRING, not fractal numeric.)
2) PDF converter can't process correctly a value that is calculated in the Excel sheet by some complicated way.
Following our investigations, the resulting PDF file contains an incorrect value if an error occurs somewhere in the calculation chain (even if this error is handled using ISERROR function and there is a correct final value). It's just a hypotesis. Perhaps when FlexCel processes such cell, it may use some incorrect value (may be intermediate one).
Thank You!. We made few workarounds to fix the issues.
In case any new problems we will send you a file.