I installed and activated the module mod_security. then I enabled the modsecurity_crs_41_sql_injection_attacks.conf.

For each form, when I submit, I have an error 403 forbidden

Error log:

[Wed Nov 15 16:53:03.324516 2017] [:error] [pid 27760] [client] ModSecurity: Access denied with code 403 (phase 2). Pattern match "([\\~\\!\\@\\#\\$  \\%\\^\\&\\*\\(\\)\\-\\+\\=\\{\\}\\[\\]\\|\\:\\;\"\\'\\\xc2\xb4\\\xe2\x80\x99\\\xe2\x80\x98\\`\\<\\>].*?){4,}" at ARGS_NAMES:field_cl_address[0][format]. [file "/usr/share/modsecurity-crs/activated_rules/modsecurity_crs_41_sql_injection_attacks.conf"] [line "159"] [id "981173"] [rev "2"] [msg "Restricted SQL Character Anomaly Detection Alert - Total # of special characters exceeded"] [data "Matched Data: ] found within ARGS_NAMES:field_cl_address[0][format]: field_cl_address[0][format]"] [ver "OWASP_CRS/2.2.9"] [maturity "9"] [accuracy "8"] [tag "OWASP_CRS/WEB_ATTACK/SQL_INJECTION"] [hostname "www.d8.dev.xxxx"] [uri "/node/add/occlient/19784"] [unique_id "Wgxw738AAQEAAGxw91sAAAAO"] 

Can anyone explain the cause?