Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member. -
Professional support
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Plugins, theme and development
. I don't answer to private message.
Thank you very much for your support. I created a similar theme and the problem is solved. However, I am still thinking about how did this happen since no one have access to the questionnaire as an administrator except me and I haven't been accessing Limesurvey in the last few days...