Module class Suffix

I changed module class suffix in the picture Gallery module form "dark" to "light".

Afterwards I wanted to change it back to dark again.

It doesn't work anymore...I tried "defaul"t as well...nothing changes...I cleaned cache in Joomla and Browser, still no change...

No matter what I type, in the frontend it stays on light...

What is going wrong?

please show us the webpage ... can't do much without www...

site is not on a server yet...

I did not change anything besides the text "dark" into "light".

Hi

I'm trying what You say on my copy of the template and everything works fine. So I would really need to see it to say anything.