Python Mechanize-Plugin omits content of <b>-brackets in response

Question

I am trying to extract text from a server-generated results page to a former query. The website is built in PHP, so I'm using the mechanize browser to interact with the page from Python.

Problem: Already in the raw response text passages of the page in -tags is missing: With one exception all characters from the tags except ":" are missing. These are definitely shown in the page source in mz regular webbrowser.

I use fairly standard mechanize code (excerpt of relevant lines):

br = mechanize.Browser()
br.open(webpage)
br.select_form(nr=0)
for i in q:
   br.form[i] = q[i]
resp = br.submit()

What should look like this: <b>Material:</b> example looks like this: <b>:</b>