Running LibreOffice on MAC runs into problems;hung in veryfying app.

I downloaded LibreOffice 6.0.7 and installed it on my MAC. When I opened it, it got into verifying app and gets hung. It is doing something that I have not experienced it earlier: it expands the memory and consumes all memory I have 16GB and then get into the memory pressure situation. Something seems to be wrong here. I tried it with the newer version which is fresh. Same thing. I had to kill the process and recover from it. I am running OS X Yosemite version 10.10 so it does not have the same issue as mountain Lion. I also tried to open from the context menu got see if that help. But NO, it runs into the same issues. By the way, it never asked me for system admin password, and that was strange. Because it usually asks me for that when I open a new app.

Is there someone who has experienced the same issue, or someone can help?

Thanking you in advance,
best regards,
Yashvant Jani