Lack of a seal, a font type that wasn’t in use at the time the certificate was issued and a certificate number that wasn’t in the correct range used at the time. Is it any wonder people are asking questions? Last time I checked something like that was called a forgery.
Hawaii law prevents the State from releasing a copy of Obama’s birth certificate, it doesn’t prevent Obama from releasing a copy.

For an issue that would be so easy to resolve, why has it gone on so long?

It isn’t public record. Due to identity theft, the state of Hawaii passed a law prohibiting people other than the individual or immediate family from getting a copy of the birth certificate.

Obama has released a digital copy / scan of the certificate, but it raised more more concerns such as font type, lack of an official seal on the document, and a certificate number that may be inconsistant with the range of numbers used by Hawaii at the time.

Say you get pulled over by the police and don’t produce a driver’s license. You go to the station, call you lawyer. Your attorney asks you if you are in possession of a driver’s license. You say yes. Your attorney says, “Produce it so we can all go home.”

It would seem running for president of the US warrants a higher level of compliance with cooperation.

Unless you aren’t a citizen.