@@Jack_mcs
Well, in the settings I entered α=>a,β=>v,γ=>g,δ=>d,ε=>e,ζ=>z,η=>i,θ=>th... etc... so that it can convert the greek characters to latin in the url.
Is there any way to keep the greek characters in the url as they are? For example mysite.com/αβγδ instead of mysite.com/abcd
Also it is generating an infinitive loop in the subcategories, so that they cannot load!