Created attachment 85916 [details] Demonstration The attached document exibits this behaviour. The header text is duplicated.
Reproducible with 3.6.0.4-4.1.2.1 under Win7x64. Not reproducible with 3.5.6.2 -> regression.
Created attachment 85951 [details] PDFs generated by MS Word 2013 and LO 4.1.2.1 The top header is single in MS Word, but is shown twice in LO.
Still reproducible with 4.1.5.3. No more reproducible with 4.2.0.0.beta1 and later -> WORKSFORME