http - Web server - weird characters generated at the top of page -

When first goes to a detail page, 4 strange letters appear at the top of the page after refreshing the page These characters disappear.

This is not coming from any output code, and I'm pretty sure this is a server configuration problem. The closest thing I can find is to include HTTP 1.1 chunked encoding.

Example Letter:

8b2

8e4a

d878

8b50

reference page:

This looks as a chunk encoding where Until I know, this is not an optional feature in HTTP, so that your users Apply it to the agent.

Is your server-side code to get data from external web sites?