hi sheen,
Text data we may load thru text data sources. so please check your info object text data source.
whether you loaded medium/long/short.
Even please check info object settings at RSD! maintenance level and bex tab.
There is display option - as per this option text(long/short/medium) will be displayed at bex.
Lets load long text thru from your text data source and check the data at report level.
at bex and info object level, lets keep display option as long text.
Thanks