Front-End adding Hyphen "-" to <iframe> and <object> tag - Joomla! Forum - community, help and support

we experiencing following issue on few recent site we've created.

joomla! 2.5.6.
php 5.3.13
mysql 5.5.24-cll

when saving article front-end containing embedded video, using either <iframe> or <object> tag, tags code changes <i-frame> , <o-bject> , video not display obviously.

this happening if article edited front end, works fine if done administrator panel. accounts set no text filter in global configuration panel , no editor used.

can figure out why front-end editor adding hyphen "-" tag?

components installed:
akeebabackup
rsfirewall
rsforms

thanks,

figured out rsfirewall causing issue.