wrapper class missing

Something strange happened and i am not sure if it could be related with the last update i made from responsive/ADAPTIVE THEME.

suddenly, the wrapper-div is not getting the correct templateclasses assigned anymore and therefore is not keeping any content where it should be. before the pages looked perfect, but now if i open one and save it again all the speific template classes that shoudl go inth e body tag are missing.

how could this happen? i am using a child theme but even if i replace the templates with the original files the wrapper class is lost.

.page-template-sidebar-content-page #wrapper {
max-width: 960px;
it is this part that is not called anymore because page-template-sidebar-content-page is not going inside the body tag anymore. same post. noch change, just saved again.

i turned off all plugins to see if it might be a bug related to a plugin but nope

please advice how i could find the reason