I am re-baselining a project and coming upo against no end of issues with it. Only some activities in the baseline need to be changed hence why I am updating and not creating a new baseline. BUT P6 seems to lose a lot of the activities after the baseline has been restored for some reason.

These are the actions I am taking;

1. I restored the original contract baseline from my project in order to make a copy and amend it then apply it as the new baseline.
2. I added a baseline to my live project by re-installing my original contract baseline to test it and all was the same.
3. I then went into the baseline copies that I had made in the enterprise node and checked that there were a full complement of activities and there were so it had obviously restored correctly.
4. I then returned to my live plan and added the copied projects as baselines.
5. When I assigned them as the project baseline the majority of the baseline activities were missing. Always the same activities and all copies were the same. 

I cannot find any reason for this to be the case there is no reason, no filters and I am using a default view.

Please help! I have no idea why the activities are not copying over to a baseline. Im hoping its a very simple answer! :-)

Thanks in advance