Concerning mysterious posts

I know this is happening with debit cards, but I am not sure about credit cards. If you are looking at your account online you may notice a large amount charged($65 or more). Then the amount will change back to the amount you know should of been charged. What is happening is the companies are putting a hold on your account for a short time. They are making sure there charge is being filled. This presents a problem. You may be denied the use of your card, or even worse. You could be charged overdraft fees. Kind of sneeky. Hopefully this is not allowed to keep going on. Hopefully all can come to the site and visit.