I would say it should be straight when not under tension. I have a fractional rig, also and when detached it is straight.
The million dollar question is; is it critical? Obviously an aluminum
pole constantly flexed will eventually stay bent.
How bad is the bend?
Do you still have some tension in the rigging
when it is properly tuned?
Do some of the stays flap in the wind
? (zero tension?)
Can you get a good sail shape with it bent?
You may have to get some one familiar to look at it, ...post a pic.
And if it is bent TOO much, it may need repaired or replaced.
If not, it will be something for you to keep an eye on, while you use the remaining life sailing it.