missing mails in gmane.comp.lang.erlang.general etc.

Hi there,

Recently I have seen mails missing from some groups for example
gmane.comp.lang.erlang.general. I noticed because some replies to my
post have my email in the CC and it landed in my phone but not Gnus. Any
idea what is going on? Thanks.

For example, all mails in March for the above group is in
http://erlang.org/pipermail/erlang-questions/2018-March/date.html I
don't think they all end up in gmane though.

Leo