mod_ruby + amrita = strange behaviour

Hello,
I'm doing a little test project. A website that lists proxies.
I use mod_ruby in combination with Amrita template parser.
The method below allows me to format my datastructure into a table:

     60     def test()
     61         # the actual data
     62         pls = ProxyListStorage.new("data/proxies_checked.marshal")
     63         proxies = pls.inputMarshal()
     64         proxies = proxies.slice(1, 21)
     65         data = pls.outputAmrita(proxies)
     66         data = { :list => data }
     67         tf = TemplateFile.new("content/proxylist.tpl.xhtml")
     68         tf.prettyprint = true
     69         tf.asxml = true
     70         tf.expand($stdout, data)
     71     end

When I run this script with the commandline ruby interpreter, its OK.
However, when I use my browser, the following thing happens:
The first time the table-size is changed (ex, proxies.slice(2, 19)).
I first get no output, then I get this output:
#<Proxy:0x8817a2c>
#<Proxy:0x88179c8>
#<Proxy:0x8817964>
#<Proxy:0x8817900>
#<Proxy:0x881789c>
... (times 19-2)
Then another reload, and I get the right content.
This only happens when I change the slice()


Anyone who has seen this before somewhere?

dodo