Originally, the Utah-based PAC had reported that $208,000 of its expenses had gone to "For Bahm Marketing." But the owner of New York-based Bahm Marketing later told the website BuzzFeed that he was only paid $20,000.
The report was amended last week to say that funds went to The Network Cos., which is owned by Weaver.
Mark Thomas, head of Utah's Elections Office, had opened an investigation into the disbursement but said Monday he is likely to drop the probe after the filing was amended.
"I don't see anything else that would need to be reviewed," Thomas said, noting that the filing was made on time albeit with incorrect information and was amended as allowed under state law.
Weaver said that the quick rush to build a national campaign from scratch is why the cost was so high.
"Other campaigns had years to gear up and spent literally millions to do so," Weaver wrote in an email. "We rushed an effort overnight with some of the top political talent in the country. That type of effort, especially in a hurry and trying to make up ground, is not cheap."
Huntsman, a multimillionaire, poured more than $4 million of his own money into his campaign, and he still owes about $1.3 million to vendors, according to his last filing with the Federal Election Commission. Some vendors have considered suing over the unpaid debts.
Huntsman, through a spokeswoman, declined to comment.
The Horizon PAC, which could accept unlimited contributions for use once the presidential campaign officially began, was largely funded by Huntsman's family, including a $350,000 contribution from his dad, Jon Huntsman Sr., and mom, Karen. Huntsman's brothers kicked in another $200,000.
Tim Riester, a Phoenix-based marketing consultant who is the treasurer of the Horizon PAC, said Monday that The Network Cos. managed a "significant amount of work" and also administered a number of vendors and subcontractors.
"In fact," he said, "much of the billing from The Network Companies was reimbursable outside costs and not professional fees."