This is my guess without grounds.
All HTML tags were converted to lower case at Q2A V1.6 beta2. Your title and first description tag are upper case. Therefore you may be using older Q2A version than V1.6 (e.g. V1.5, V1.4, etc). And, second description tag is lower case. Therefore program outputting this code (second description) may be a relatively new thing. Did you install some kind of plugin that are incompatible with older Q2A version? (e.g. Plugin to be related to SEO)