Are you using a parallel port, or motion controller? IF your using a motion controller, it could be causing the issue.
When you resume from a pause (feedhold), the feedrate will be the same. Just look at the feedrate DRO on the screen before and after a pause, it should be the same, unless there's a change in the g-code.
Feedrates in g-code are modal, meaning they stay in effect until there's a new feedrate command.