I got abnormal pap test immediately following leep procedure. Did the procedure cause the problem?

No. No, but the dysplasia may not have totally resolved after the leep. It is very important that you follow up as recommended by your physician to determine if additional excisional procedures are needed to prevent the dysplasia from progressing to cervical cancer.
Abnormal cells. No, a leep procedure is done to treat abnormal cells on the cervix. A repeat pap should be done 6-8 weeks later. If there is still an abnormality then you and your doctor need to sit down and discuss options.