USPS Click-N-Ship Auto-Fill v1.6 could be the guilty one? But here is my list of mods.

additional_images_v.1.1
column_layout_grid_2_3_1 SQL
Image_Handler4_v4_3_1 (auto installer)
Short Description for Categories 1.3 SQL
ckeditor-for-zencart
captchaUsing_ttf__gd__TelephoneNotRequired_v3.0 SQL
Multi Cross Sell (merged - creates new Xsell table, might need to back up table first) upload Admin_Page_Install to apply install
edit_orders_1 (Edit Orders 4.1.1) SQL
Admin_Login_As_Customer_v3.1_For_ZCv151 SQL (might not need as MP is installed?)
USPS v15 Ratev4 2013_0127 R2013_0729_J5
UPS United Parcel Service
Google Merchant Center Feeder 1_14_0
ceon_uri_mapping_4.4.1_for_zc merged
EasyPopulate-4.0-master
IntegratedCOWOA_2.4 SQL
USPS Auto Fill mod, partial, just to pull order total weight, SQL