If possible, go back and check those wire runs for hard bends, kinks, twists, pinches, nail or staple penetrations - any physical damage. You may realize that the cable(s) were not correctly or properly run.
On both ends of any wires that you run leave a "service loop" inside the wall so there is some extra wire already in place in case some termination does need to be redone. Do not staple down that loop.
Mark the wires on both ends so you know which wires at the patch panel go to which wall jacks in each room. And put the same information on the inside of the cover plate for the wall jack. Draw out a general sketch. If you have a copy of the house floor plan use that to show where the wires are run. Document the runs and take photos for reference purposes. Especially in hard to get to areas. Saving a trip into the attic is generally a good thing..... All the more so for a crawl space.....
Plugs: wires are stranded and solid. Ensure that you use the correct/applicable plugs. If you do the practice terminations and crimps (as suggested above and that you should do) you will probably discover any mismatches. And per
@AllanGH do pay attention to the RJ-45's orientation. I.e., clip pointed away from you.