Yes, there is a redirect on your website specifically for Google’s mobile UserAgent. I was able to visit your website, but once I tried to do so as Google it redirected me.
This usually tends to happen when a website may have been hacked through a vulnerable plugin or theme. I can’t say where it is. Usually, a modified file or a set of malicious files inserted into WordPress will cause something like this.
You need something (or someone) to go through the PHP files and try to identify infected or malicious files. The first thing I would try is:
https://www.ads-software.com/plugins/gotmls/
It’s not perfect and might not be 100% accurate, but it usually does find some of the infected files.
You can find some additional information here:
FAQ My site was hacked
Also, I think I noticed your site is using PHP 5.6. That’s very outdated and can cause problems. So see if 123-Reg can upgrade you to something more recent (7+), ideally 7.3 or 7.4.
Hope that helps.
For moderator: remove possibly malicious URL from the original post.