blog type don't set the type I choose

in Blog Type when I set a type and than save, at refresh it always show the same type (not what I choose).

I've the last version of the plugin and the last version of WP.
I don't use sub type.
I'm preatty sure the file in plugin folder is ok 'cos you guys check for me last time I had a problem with this plugin.
After your support it worked fine.

I also notice if I set multiple type choise, after saving the default (wrong) selection are more than one (neither of them choosen by ne)

Could you help me to figure out what the problem is?