Premature atrial complexes are often referred to as PACs and are considered benign.
On more than one occasion I have been told by Drs. that the automatic read outs on these strips are not always accurate.
Seems like you have some other type of rhythm than sinus rhythm on one of the EKGs, possibly the last one. It looks like the rhythm origin somewhere else in the right atrium, possibly near the AV node (as the P wave axis is different and PR interval is shorter).
Unfortunately, I can't give you any other advice than to ask your doctor. Atrial ectopic rhythms are almost always benign though.