I had the same issue at first, which was due to me not following the steps correctly. So maybe try the way I fixed it.
First Delete everything and start again.
Then import the file, go to ‘Project’>’Maintain Baseline’ then add the baseline.
Then ‘Project’>’Assign Baseline’ and choose the the project for ‘Project Baseline’ and ‘Primary Baseline’
Then add all the events and make all the relationships and make sure to go into ‘Bars’ and tick ‘Primary Baseline’ bar.
Finally add the ‘BL Project Start’ and ‘ BL Project Finish’ to see the date variance.
I hope this helps.