There is nothing to worry about and it is not related to you buying jailbreaks apps.
Paypal recently implemented a new system and you account can be flag for review for many many reasons.
My Account had been flag twice in the last month. First time was due to me moving, and it turn out that the person that moved to my old address got into some issues with the law (somehow that got back to paypal and it matched my previews address).
Second time, was due to multiple logins from different locations, this was due to me using Paypal and BillmeLater from 3 location in a 2 days period. Again, I just email them my information and ID forms and in just a few hours my account was up and running again.