All links on Facebook App are not clickable

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I have Facebook App and web site.
Facebook App :
Web site :
In Facebook App, we insert website url to Canvas Url
Until a few weeks, Facebook app and web site are working well. i think.

My Problem seems to be Iframe issue (target issue) or Facebook bug.
1) Web site is still working well.
2) In Facebook App, when i click all links, these links didn't work well.
But, when i open with new window, it would work well.
I recognize this problem is target problem in html.
So, i forcefully put the "base target = _top" in every page.
After that, links problem was solved in almost Browsers (Chrome, FF, Safari, etc...)
But other issue happened.
I think it's not good solution.
So, i removed base target tags.

Could you help?
I think it's not server issue and program issue because .... when i click one of all links on FB app, no traffic to our server.
Our System is made by JAVA, Spring framework.


Skills required:
Facebook Marketing, HTML, Java, Javascript, JSP
About the employer:
Public Clarification Board
Bids are hidden by the project creator. Log in as the employer to view bids or to bid on this project.
You will not be able to bid on this project if you are not qualified in one of the job categories. To see your qualifications click here.

$ 257
in 3 days
$ 147
in 3 days
$ 100
in 1 days
$ 30
in 3 days