Which version of internet explorer are you using?
It might be this problem : https://confluence.atlassian.com/display/JIRAKB/Compatibility+Mode+related+problems+on+Internet+Explorer
Do you also have this problem when using a different browser?
You will need to clear the work directory, located normally under your tomcat/JIRA installation folder.
This is the caches built and it might be corrupted.
Perform a deletion on that and restart, you problem should be gone :)
Just another quick test, can you try clearing the browser cache and see if this issue is resolved?
Also you can try accessing your JIRA without proxy and locally using the same browser see if you are able to load the page correctly?
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