iRule causing requests to be duplicated (sometimes)

We are using an iRule to manage access to a SPA, which requires REWRITE to be disabled. Without this rule the SPA application does not work. However, when the rule is enabled we are seeing duplication of requests within our other (non SPA) applications. We notice this especially with file uploads and SQL insert requests. If we remove the iRule the non SPA applications work correctly, but the SPA application does not. 

Here is the iRule.

-----

when REWRITE_REQUEST {
    if {[HTTP::uri] starts_with "/apps/appname/uid/sso"} {
        REWRITE::disable
    }
}

when REWRITE_REQUEST_DONE {
    if {[HTTP::uri] starts_with "/uid"} {
        REWRITE::disable
    }
    if {[HTTP::uri] starts_with "/apps/appname/uid/sso"} {
        REWRITE::disable
    }

  REWRITE::post_process 1
}