It is not an issue that I am aware. We use user-agent sniffing on the server to determine the hosting browser and use a relative standard library for determining browser and version. I know that other projects receive browser statistics that include IE so we do detect it. I just dug into the data and as you mentioned, Firefox and Chrome are the two major browsers, IE is currently only registered with two sessions.
I'd like to help you investigate the issue, so I've enable some data capturing in our pipeline on data from your product and I can inspect the data to see the specific user-agents being received. If you could try your solution a few times from different browsers I can see specifically what we are receiving.
I'll get back to you later with info on what has been received.
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