Ania L, you asked the same question which was on my mind for a long time.
And thanks to Giselle Maine for her answer. Next time I take care not to use MS Word. It is bit weird sometimes.
When I copy text from MS Word to HubPages, the two spaces I give after every sentence disappear!
These days, I write article in MS Word, then I copy the whole content to a text file, then I copy paste into HubPages.
for Titles, I still use the MS Word. Now, not any more! Thanks Ania L and Giselle Maine!