Have removed trailing slash but it still appears on home page

Hello

We don't want the trailing slash on our URLs. In Settings > Permalinks I have chosen 'Custom Structure' /%postname% and this works perfectly to remove the trailing slash from all URLs. However, in Safari browser on iPhone, the home page appears as http://www.performanceconsultants.com/

The trailing slash is not seen on the home page on IE, Chrome or Firefox on Windows but when I check the Live Traffic on Wordfence plugin it shows hits to the home page as http://www.performanceconsultants.com/.

Is it possible to remove the trailing slash on the home page too?

Thanks very much

Frances