Directadmin MODSEC rules disable.

Tracking ID
Login user level > Directadmin 
Click > Site Summary / Statistics / Logs
Click > Web Error Log
find the keyword with id with 6 number digit, and copy the number.

Add ModSec ID to skip list.
Click > Directadmin Home button backup to main page.
Click > Domain Setup
Click > Domain
Click > Modify button at ModSecurity section.
Paste the rules ID into the ID box and click Add SecRuleRemoveById.
Wait 2 to 3 minutes to allow the setting active.