My kids is a different blood type from me and there dad does that mean i have a problem i'm o+ and there dad is ab+ and they is b+
Yes. You are O and the father is AB, hence your kid could have either A (AO) or B (BO) only. However I would suggest you consult your doctor form more in-depth information. Visit www.biology.arizona.edu/human_bio/problem_sets/blood_types/inherited.html to learn more.