I have two calc and one writer files that are all for the same project. If I open them individually, they open normally. But if I select all three and hit Enter to save myself some clicking, they instead open as three Untitled files. The content is all there, but obviously this isn’t ideal if I want to make changes and save the files again.
Have no such problem on Mint 18.3 using LO v184.108.40.206 from TDF. Did same process - 2 Calc & 1 Writer.
What is your OS and the version of LO?
LibreOffice 220.127.116.11 (x86) (Windows 6.1) don’t show the problem.