SAN DIEGO -- Hundreds of San Diegans are being overcharged on their property taxes and a computer system glitch is being blame for it.

The glitch affected nearly 800 county taxpayers and charged double, and in some cases even more. Some residents might not even know they have been overcharged.

It's not easy paying property taxes on homes like the one belonging to Kenneth Coppola in Sunshine Summit. 10News received several e-mails from viewers like Coppola who claimed they were being charged double the normal amount for property taxes.

Coppola recently paid his county property tax online using the "E-Check" system.

"And I'm glad I printed it out like I did," said Coppola.

On March 14, the service took $918 directly from Coppola's checking account and he thought he was set.

"On March 17, they took it out again," said Coppola.

The county deducted an additional $918 out of his checking account.

"The second one, I says, 'Oh boy, there's some people going to be mad at me,'" said Coppola.

Coppola had other bills to pay but could not cover them. The San Diego County Treasurer-Tax Collector's Office told him someone would get back to him.

"Our reaction was, for us, we're on a fixed income, it was almost, it was panicky," said Coppola.

When 10News inquired, a county spokesman said the problem began last week. Northrop Grumman, which operates the county's IT services, was upgrading the E-Check system. While the system was down, the taxes were manually transferred for 766 property owners. When the system was turned back on, the computer transferred the same amount of money again for all 766 people.

"This amount of money is a lot of money, especially for us. We're retirement folks in this community," said Coppola.

In a statement released through the county, Northrop Grumman said, "We take our responsibilities to the County of San Diego and its citizens very seriously and will undertake all measures to help correct the situation as quickly as possible."

The county said everyone will be refunded in the next few days. In the meantime, some of the property owners were fined by their banks for being overdrawn.

Coppola said he is happy he's getting his money back.

"And things like this do happen and it's unfortunately has to be the government," said Coppola.

The county said it will contact all 766 property owners to fix any other fees that may have been stuck with.