Anyone else ever experience not being able to checkout on Walmart,com?

Could be a glitch in their system. I ordered something through another company that places the orders to Walmart (an insurance over-the-counter benefit that allows $50 every 3 months to be ordered) on Friday and the lady that took my order called me back and said that after she had saved all the information and ran the order that it wouldn’t go through. I had to give her my card number again and she ran it again maybe 15 minutes later and it went through that time.