my kindle doesn't show proper file name in case of pdfs

Hello everyone.

I noticed that names of pdf-books uploaded to my kindle are displayed as "title - author" and the author appears again in the author field. Mobi books are displayed properly. The same thing happens to the books sent to the amazon cloud.

Also all the ":" in the titles are changed into "_". I know you can't save a file with ":" in the filename but why can't it be in the title on kindle?

Can anyone be of assisstance? I would appreciate if someone could post some links to the similar threads or tutorials.

thanks in advance