Multiple CSS classes on an element are not correctly resolved when converted to inline styles.
Before:
.TelerikNormal {font-family: Calibri;font-size: 14.6666666666667px;margin-top: 0px;margin-bottom: 0px;line-height: 100%;color: #000000;}
.TelerikHeading3 {font-family: Calibri Light;font-size: 22.6666666666667px;}
<p class="TelerikNormal TelerikHeading3"><span>Test</span></p>
Due to order priority, the TelerikHeading3 values override the TelerikNormal values. The font-size becomes 22.6666666666667px.
Convert:
provider.ExportSettings.StylesExportMode = StylesExportMode.Inline;
<p style="font-family: Calibri;font-size: 14.6666666666667px;margin-top: 0px;margin-bottom: 0px;line-height: 100%;color: #000000;"><span>Test</span></p>