OK, I verified that the bug appears only when running evolution with italian locales:
$ locale LANG=it_IT.UTF-8 LC_CTYPE="it_IT.UTF-8" LC_NUMERIC="it_IT.UTF-8" LC_TIME="it_IT.UTF-8" LC_COLLATE="it_IT.UTF-8" LC_MONETARY="it_IT.UTF-8" LC_MESSAGES="it_IT.UTF-8" LC_PAPER="it_IT.UTF-8" LC_NAME="it_IT.UTF-8" LC_ADDRESS="it_IT.UTF-8" LC_TELEPHONE="it_IT.UTF-8" LC_MEASUREMENT="it_IT.UTF-8" LC_IDENTIFICATION="it_IT.UTF-8" LC_ALL=
if I run it with LC_ALL=C the bug isn't present
OK, I verified that the bug appears only when running evolution with italian locales:
$ locale "it_IT. UTF-8" "it_IT. UTF-8" "it_IT. UTF-8" "it_IT. UTF-8" "it_IT. UTF-8" "it_IT. UTF-8" "it_IT. UTF-8" "it_IT. UTF-8" "it_IT. UTF-8" "it_IT. UTF-8" "it_IT. UTF-8" ON="it_ IT.UTF- 8"
LANG=it_IT.UTF-8
LC_CTYPE=
LC_NUMERIC=
LC_TIME=
LC_COLLATE=
LC_MONETARY=
LC_MESSAGES=
LC_PAPER=
LC_NAME=
LC_ADDRESS=
LC_TELEPHONE=
LC_MEASUREMENT=
LC_IDENTIFICATI
LC_ALL=
if I run it with LC_ALL=C the bug isn't present