I don't like the quality of the envelopes you are using. They are cheap looking and cheap feeling.
I saw your note about the envelopes included with the cards. I checked your order and it appears you chose the standard white envelope which is the most popular, least expensive option. For future orders, you may want to consider upgrading to the white felt envelope which is a slightly heavier paper weight.
If you ever have any questions or concerns, please feel free to reach out before placing your order.
Easy to use inserts
Have been using these inserts for many years to make my own special cards with my photos. Very easy to use and like that the back is blank. I like the variety of colors even though I always use the white or off white with my photos.