chowyungunz:
What version of Zen Cart are you using? 1.5.1
Has your site been upgraded? New Install
What plugins/addons have you installed? reCaptcha
When? Just after installation
HOW did you install Zen Cart? one-click install from hosting company
What version of PHP and MySQL is your server using? PHP Version: 5.2.17 Database: MySQL 5.5.40-36.1-log
In what ways is your site customized or different from a brand new uncustomized install? None other than picaflor-azul template and reCaptcha
HAVE YOU LOOKED IN THE FAQ AREA for answers to your question? Yes
Have you searched the FORUM for your error message or for answers to the question you're asking? Yes
So, there is a possibility that the issue resides in the code that was provided by the host provider as this was a one click install.. Now that said, there are a few ways to move forward some of which depend on the tools you have available to work with/compare the code, others to just start over on the files... More than likely the database is okay, but the files are likely in question... To be absolutely sure though one could start over with the database and files, but I know that installation of the template can be a bit time consuming, though the quality of the templates from pica-fluor are some of the better looking. :) the easiest thing to try to do would be to download an unaltered copy of ZC from the zen-cart site (http://www.zen-cart.com/getit) there is a newer version than what you have installed, but the php version may need to be increased to fully support it and that may not be possible on your current host. Anyways, after obtaining a fresh copy, then the files would be compared to identify differences within the files and the presence of additional files in your store's version and possibly absence of files... Of course there will be some because of what has been installed/modified, but those should be relatively familiar to you.
I'll try the same action on a copy of 1.5.1, but I don't think I should expect the same problem...
On another note, did the order number by chance attempt to be changed at the same time as someone navigating the site or while checking out?
ZC Installation/Maintenance Support <- Site
Contribution for contributions welcome...