Measures have wrong number of beats after PDF import

I tried to import a pdf lead sheet to save me some time creating my score. I have some notes (enough to save significant time), but the measures do not always have enough notes/rests to account for all 4 beats. I can't figure out any way to force more into the measures that are not correct. It's not even consistent. Once measure has 2 1/2 beats; the next one has 3 1/2.

Is there any way to successfully edit this without deleting the measures that don't have enough beats? I have included a screen shot showing the issue.